The D-and F-block Elements Questions

We provide the d-and f-block elements practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on the d-and f-block elements skills mastery so, below you will get all questions that are also asking in the competition exam beside that classroom.

List of the d-and f-block elements Questions

Question No Questions Class
1 Why are ( M n^{2+} ) compounds more stable
than ( F e^{2+} ) towards oxidation to their
+3 state?
12
2 Maximum oxidation state is shown by
which pair of elements?
A ( . N p, P u )
в. ( C f, B k )
c. ( N p, ) Pr
D. ( A c, T h )
12
3 What is tailing of Mercury? 12
4 ine
45 When orange solution containing Cr 03-ion is treated with an alkali, a
vellow solution is formed and when H+ ions are added to yellow solution,
an orange solution is obtained. Explain why does this happen?
12
5 What do you observe when water droplets fall on blue cobalt chloride? 12
6 is a metal that exist as a liquid at room temperature 12
7 Q. 14 The pair of ions having same electronic configuration is ..
(a) Cr3+, Fe3+
(b) Fe3+, Mn2+ +
(c) Fe3+, CO3+
(d) Sc3+, Cr3+
12
8 To which of the following series the transition element from ( Z=39 ) to ( Z=48 )
belong.
( A cdot 3 d ) series
B. ( 4 d ) series
c. ( 5 d ) series
D. ( 6 d ) series
12
9 The hardness, melting point and boiling point of elements increase from Ce to Lu
because:
A. the attraction between the atoms increases as the size increases
B. the attraction between the atoms decreases as the size increases
c. the attraction between the atoms increases as the size decreases
D. the attraction between the atoms remains the same as the size increases
12
10 Which of the following transition element shows the highest oxidation
state?
( mathbf{A} cdot M n )
в. ( F e )
( c cdot V )
D. ( C r )
12
11 Which of the following belongs to actinoid series of elements?
A. Nd
B.
( c . mathrm{sm} )
D. Al
12
12 Q. 14 Interstitial compounds are formed when sm
compounds are formed when small atoms are trapped inside
stal lattice of metals. Which of the following is not the
characteristic property of interstitial compounds:
(a) They have high melting points in comparison to pure metals
(b) They are very hard
(c) They retain metallic conductivity
(d) The are chemically very reactive
12
13 Which compound is volatile on heating?
A. ( M g C l_{2} )
в. ( mathrm{HgCl}_{2} )
c. ( Z n C l_{2} )
D. none of these
12
14 Transition elements have high MP & BP
due to:
A. use of ns electrons
B. use of (n-1)d electrons only
c. both ns and (n-1)d electrons
D. use of np electrons
12
15 The landthanide contraction is
responsible for the fact that:
A. ( Z r ) and ( Y ) have almost the same radius.
B. ( Z r ) and ( N b ) have similar oxidation state
c. ( Z r ) and ( H f ) have almost the same radius
D. ( Z r ) and ( Z n ) have the same oxidation state.
12
16 Platinum, Palladium and Iridium are
called noble metals because:
A. Alfred Nobel discovered them
B. they are shining lustrous and pleasing to look at
C. they are found in native state
D. they are inert towards many common reagents
12
17 Question 7. What is lanthanoid
consequences of lanthanoid contraction
contraction?
What
are the
12
18 Chromium seem to be less reactive
than estimated from its standard
reduction potential value because of formation of oxide layer. If true enter 1 , else enter 0
12
19 Which of the following ions is a good oxidising agent?
( A cdot E u^{2} )
B. ( mathrm{ce}^{4} )
( c cdot y b^{2} )
D. ( mathrm{Sm}^{2+} )
12
20 State whether the given statement is true or false:

Copper metal reduces ( F e^{2+} ) in an acid
medium.

12
21 The outer electron configuration of Gd
(Atomic No.64) is:
( mathbf{A} cdot 4 mathrm{f}^{3} 5 mathrm{d}^{5} 6 mathrm{s}^{2} )
B ( cdot 4 mathrm{f}^{4} 5 mathrm{d}^{0} 6 mathrm{s}^{2} )
C ( cdot 4 mathrm{f}^{2} 5 mathrm{d}^{4} 6 mathrm{s}^{2} )
D. ( 4 mathrm{f}^{7} 5 mathrm{d}^{1} 6 mathrm{s}^{2} )
12
22 Fuel used in nuclear power plants is:
A. Uranium – 235
B. Plutonium – 235
c. Plutonium – 238
D. Uranium – 238
12
23 What is the oxidation state of coloured
ion in ( boldsymbol{C r} boldsymbol{O}_{4}^{2-} ) ?
12
24 A reduction in atomic size with increase
in atomic number is a characteristics of
which elements?
A. d-block
B. f-block
c. radioactive series
D. high atomic masses
12
25 Which of the following ion has the maximum theoretical magnetic moment?
( mathbf{A} cdot V^{3} )
в. ( C r^{3} )
( c cdot T i^{3} )
D. ( C o^{3} )
12
26 ( mathrm{Cr} mathrm{O}_{2} mathrm{Cl}_{2} ) is formed while testing:
A ( cdot N O_{3}^{-} )
B. ( C l^{-} )
( mathrm{c} cdot mathrm{Cr}^{3} )
D. ( F e^{3} )
12
27 1)Write down IUPAC name and symbol of the following atomic number:
( 111,105,102,115 ? )
2)Why do Zr and Hf have similar radius?
12
28 Elements with high melting point are
present in:
A . p-block elements
B. s-block elements
c. d-block elements
D. None of these
12
29 Write the uses of actinides. 12
30 The electronic configuration of actinides cannot be assigned with degree of certainty because of :
A. overlapping of inner orbitals.
B. free movement of electrons over all the orbitals
c. small energy difference between 5 f and ( 6 d ) levels.
D. none of the above
12
31 The electronic configurations of the first
four members of the actinoid series
cannot be written accurately in a
regular manner because of :
A. small difference in energy between ( 5 f ) and ( 6 d ) orbitals
B. large difference in energy between ( 5 f ) and ( 6 d ) orbitals
C. small difference in energy between ( 5 f ) and 6 s orbitals
D. violation of the Pauli exclusion principle
12
32 Choose the incorrect statement among
the following:
A. the chemistry of different lanthanoids is very similar
B. ( 4 f- ) and ( 5 f- ) orbitals are equally shielded
C. ( d- ) block element show irregular and erratic chemical properties among themselves
D. ( L a ) and ( L u ) have partially filled d-orbitals
12
33 Photochromic glass, used for sunglasses, darkens when exposed to bright light and becomes more transparent again when the light is less bright. The darkness of the glass is related to the
concentration of silver atoms.
The following reactions are involved. reaction ( 1 A g^{+}+C l^{-} rightleftharpoons A g+C l )
reaction 2 ( boldsymbol{C u}^{+}+boldsymbol{C l} rightarrow boldsymbol{C u}^{2+}+boldsymbol{C l}^{-} )
reaction 3 ( C u^{2+}+A g rightarrow C u^{+}+A g^{+} )
Which statement about these reactions
is correct?
A ( cdot C u^{+} ) and ( C u^{2+} ) ions act as catalysts
B. ( C u^{+} ) ions act as an oxidising agent in reaction 2
c. Reaction 3 increases the darkness of the glass
D. silver atoms are reduced in reaction 3
12
34 Which of the following statements is
not true about ( K M n O_{4} ? )
A. Its solution is unstable in acidic medium.
B. A green coloured solution containing ( M n O_{3}^{+} ) ions is
formed when a small quantity of ( K M n O_{4} ) is added to
concentrated ( H_{2} S O_{4} )
C. ( M n O_{4}^{-} ) changes to ( M n^{2+} ) in basic solution
D. It acts as a self-indicator in the titration with ( F e^{2+} ) or
( C_{2} O_{4}^{2-} )
12
35 The highest magnetic moment is shown by the transition metal ion with which of
the following outermost electronic configuration?
( A cdot 3 d^{2} )
в. ( 3 d^{5} )
( c cdot 3 d^{7} )
D. ( 3 d^{9} )
12
36 What is the correct order of covalent
size of the following?
( mathrm{Nb} )
A. ( mathrm{Nb}= ) Ta
B. Nb mathrm{T} )
D. None of these.
12
37 Which of the following statement is not
correct?
( mathbf{A} cdot L a(O H)_{3} ) is less basic than ( L u(O H)_{3} )
B. In Lanthanoid series ionic radius of ( mathrm{Ln}^{3+} ) ions
decreases
C. La is actually an element of transition series rather than Lanthanoid series
D. Atomic radii of Zr and Hf are same because of
Lanthanoid contraction
12
38 The Molecular weight of Mohr’s salt is
392. Its equivalent weight when it is
oxidized by ( K M n O_{4} mathrm{KMnO} 4, ) in acidic medium is:
A . 392
B. 196
( c cdot 130.6 )
D. 78.5
12
39 Q. 7 Which of the following oxidation state is common for all lanthanoids:
(a) +2
(b) +3
(c) +4
(d) +5
Lebeneide
of which also show 2 and LA
12
40 Snorl Answer Type
Question 1. Why does copper metal not replace hydrogen from acid?
12
41 Most of the transition metals exhibit:
(i) paramagnetic behaviour
(ii) diamagnetic behaviour
(iii) variable oxidation states
(iv) formation of coloured ions
A. (ii), (iii) and (iv)
B. (i), (iii) and (iv)
c. (i), (ii) and (iii)
D. (i), (ii) and (iv)
12
42 Q. 30 Which of the following will not act as oxidising agents?
(a) Croz
(b) Moog (c) WO3
(d) Cro
12
43 ( K M n O_{4} ) spot can be bleached by:
A. ( H_{2} O_{2} / H^{+} )
в. ( S O_{2} / H^{+} )
( mathrm{c} cdot mathrm{C}_{2} mathrm{O}_{4}^{2-} / mathrm{H}^{+} )
D. all of these
12
44 Question 17. Identi
17. Identify A to B and also explain the reactions involved.
CuCoz
CuO
Heat with Cus
(A)
| HNO3 (Conc.)
(B)
NH, (aq)
(C)
Blue solution
(D)
Ca(OH)2
(E)
Milky
co₂
Ca(HCO3)2
Clear solution
12
45 Which of the following statement is not ( c )
Orrect?
( mathbf{A} cdot L a(O H)_{3}, ) is less basic than ( L u(O H)_{3} )
B. In lanthanide series, ionic radius of ( L n^{3}+ ) ions
decreases
C. ( L a ) is actually an element of transition series rather than lanthanide series
D. Atomic radii of ( Z r ) and ( H f ) are same because of lanthanide contraction
12
46 Monazite is an ore of:
A. titanium
B. throium
c. zirconium
D. iron
12
47 Which of the following statement is
wrong regarding Lanthanoids?
A. The ionic size of ( L n(| I) ) ions decreases with increasing atomic number
B. ( ln ( ) III ) hydroxides are mainly basic in nature
C. ( operatorname{Ln}(text { III }) ) compounds are predominantly ionic in character
D. ( operatorname{Ln}(text { III }) ) compounds are generally colourless
12
48 27 Which of the following lanthanoids show +2 oxidation state besides the
characteristic oxidation state +3 of lanthanoids?
(b) Eu
(c) Yb
(d) Ho
(a) Ce
12
49 Each of the following ion contains
vanadium in +5 oxidation state except:
A. ( V O_{2}^{text {th }} )
B. ( V(O H)_{4}^{+} )
c. ( V O^{2+} )
D ( cdotleft[V O_{3} O Hright]^{2} )
12
50 Amphoteric oxides of Mn and Cr are:
( mathbf{A} cdot M n O ) and ( C r O )
B. ( M n_{2} O_{3} ) and ( C r_{2} O_{3} )
c. ( M n O_{2} ) and ( C r_{2} O_{3} )
D. ( M n_{2} O_{7} ) and ( C r O_{3} )
12
51 The magnetic moment is associated with its spin angular momentum and
orbital angular momentum. Spin only
magnetic moment value of ( boldsymbol{C r}^{3+} ) ion is :
( mathbf{A} cdot 2.87 mathrm{B} . mathrm{M} )
B. 3.87 В.М.
c. 3.47 В.M.
D. 3.57 В.М.
12
52 Arrange the oxides of manganese
according to increasing acidic strength.
( mathbf{A} cdot M n O<M n_{3} O_{4}<M n_{2} O_{3}<M n O_{2}<M n_{2} O_{7} )
B. ( M n_{2} O_{7}<M n O_{2}<M n_{2} O_{3}<M n_{3} O_{4} )
( mathbf{c} cdot M n O_{2}<M n_{2} O_{7}<M n_{3} O_{4}<M n_{2} O_{3}<M n O )
D. ( M n_{3} O_{4}<M n_{2} O_{3}<M n_{2} O_{7}<M n O_{2}<M n O )
12
53 The colourless species is
A. ( V C l_{3} )
в. ( operatorname{VOSO}_{4} )
c. ( N a_{3} V O_{4} )
( mathrm{D} cdotleft[Vleft(mathrm{H}_{2} mathrm{O}right)_{6}right] mathrm{SO}_{4} cdot mathrm{H}_{2} mathrm{O} )
12
54 Account for the following:
( T i^{3+} ) is coloured whereas ( S c^{3+} ) is
colourless in aqueous solution.
12
55 What is Lanthanoid contraction?
Mention one of its consequences.
12
56 Which of the following lanthanoid ions is diamagnetic?
( mathbf{A} cdot S m^{2}+ )
B. ( C e^{2} )
( mathrm{c} cdot Y b^{2} )
D. ( E u^{2} )
12
57 ale
en oily
a When KMnO4 solution is added to oxalic acid solution, the decolounsation
is slow in the beginning but becomes instantaneous after some time because
(a) CO, is formed as the product (b) reaction is exothermic
(c) MnO2 catalyses the reaction (d) Mn2+ acts as autocatalyst
fy the
whon Man
colitice
12
58 0.2 The electronic configuration of Cu(II) is 3d where as that of Cu(I) is 3d”.
Which of the following is correct?
(a) Cu(II) is more stable
(b) Cu(II) is less stable
(c) Cu(I) and Cu(II) are equally stable
(d) Stability of Cu(I) and Cu(II) depends on nature of copper salts
12
59 The only radioactive element among the lanthanoids is
A. Gadolinium
B. Holmium
c. Promethium
D. Neodymium
12
60 The elements having the general configuration, ( 4 f^{1-14} 5 s^{2} 5 p^{6} d^{0-1} 6 s^{2} ) are
referred as
A. alkali metals
B. transition elements
c. lanthanoids
D. actinides
12
61 Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the
following statements is incorrect?
A. Because of the large size of the ( operatorname{Ln}( ) (II) ions the bonding in its compounds is predominantly ionic in character.
B. The ionic sizes of Ln
(III) decrease in general with increasing atomic number
c. ( mathrm{Ln} ) (III) compounds are generally colourless
D. Ln (III) hydroxides are mainly basic in character
12
62 What happens when ( S O_{2} ) is passed
through acidified ( K_{2} C r_{2} O_{7} ) solution?
12
63 To protect iron against corrosion, the most durable metal plating on it, is :
A. nickel plating
B. tin plating
C. copper plating
D. zinc plating
12
64 What would be magnetic moment of
( boldsymbol{G} boldsymbol{d}^{+3}(boldsymbol{Z}=mathbf{6 4}) ? )
A. 7.9 BM
B. 3.62 ВМ
c. ( 10.60 mathrm{BM} )
D. 9.72 ВМ
12
65 What is the effect on density if we increase atomic number in
lanthanides?
A. Increase
B. Very low
c. Decrease
D. Very high
12
66 Which of the following is a Lanthanoid?
A. Ta
B. Rh
( c . ) Th
D. Lu
12
67 ( boldsymbol{F e}_{3} boldsymbol{O}_{4} ) is called :
A. haematite
B. magnetite
c. cassiterite
D. dolomite
12
68 In context of the lanthanoids, which of
the following statements is not correct?
A. There is a gradual decrease in the radii of the members with increasing atomic number in the series
B. All the members exhibit + 3 oxidation state
c. Because of similar properties the separation of lanthanoids is not easy
D. Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series
12
69 In the ( 3 d ) series from ( operatorname{Sc}(z=21) ) to Zn
( (z=30), ) enthalpy of atomisation of Zn
is the lowest.
12
70 [A]
Q. 67 On the basis of lanthanoid contraction, explai
sis of lanthanoid contraction, explain the following:
(1) Nature of bonding in La,O, and Lu 03.
(17) Trends in the stability of oxo salts of lanthanoids from La to Lu.
(iii) Stability of the complexes of lanthanoids.
(iv) Radii of 4d and 5d block elements.
() Trends in acidic character of lanthanoid oxides.
12
71 Oil is converted into fat by using as a catalyst.
A . Ni
B. Fe
( c . ) мп
D. ( V_{2} O_{5} )
12
72 Name the transition element of highest density 12
73 The general electronic configuration ( (n-1) d^{8} n s^{2} ) indicates that the
particular element belongs to
A. VIII group
B. V B group
c. IV B group
D. II B group
12
74 The element that has two unpaired
electrons in its ( M^{2+} ) ion form is:
A. Mn
B. cu
( c cdot z n )
D. Ti
12
75 Similarity between ( N b ) and ( T a ) is
because they:
A. are transition metals
B. belong to same group of periodic table
c. have the same mineral source
D. have almost same ionic and covalent radii
12
76 Identify the incorrect statement among
the following.
A. ( 4 f ) and ( 5 f ) orbitals are equally shielded.
B. 4 -Block elements show irregular and erratic chemical properties among themselves.
C. La and Lu have partially filled d-orbitals and no other partially filled orbitals.
D. The chemistry of various lanthanoids is very similar.
12
77 Heaviest atom among the following is:
A. uranium
B. Ieadd
c. mercury
D. radium
12
78 Spin only magnetic moment of the
compound ( boldsymbol{H} boldsymbol{g}left[boldsymbol{C o}(boldsymbol{S} boldsymbol{C} boldsymbol{N})_{4}right] ) is :
A ( cdot sqrt{3} )
B. ( sqrt{15} )
c. ( sqrt{24} )
D. ( sqrt{8} )
12
79 Which of the following statements is/are correct for the Lanthanoids?
A. The 4f electrons do not take part in bonding
B. The 4f electrons can neither be removed to produce ions nor be made to take part in crystal field stabilization of complexes
c. The 4 felectrons in the antepenultimate shell are very effectively shielded by the 5 s and 5 p electrons
D. All of the above
12
80 Percentage of Cu is minimum in :
A. brass
B. bronze
c. duralumin
D. gun mental
12
81 In which of the following compounds transition metal has zero oxidation
state?
A. ( mathrm{CrO}_{5} )
B. ( mathrm{NH}_{2} cdot mathrm{NH}_{2} )
c. ( mathrm{NOClO}_{4} )
D ( cdotleft[F e(C O)_{5}right] )
12
82 Statement 1: Transition metal
compounds generally exhibit bright colors. Statement 2: The electrons in the
partially filled d orbitals are easily
promoted to excited states.
A. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1
B. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.
c. statement 1 is correct but statement 2 is not correct
D. Statement 1 is not correct but Statement 2 is correct
E. Both the Statement1 and Statement 2 are not correct
12
83 2 54 Match the properties given in Column I with the metals given in
Column II.
Column 1
Column II
(Property)
(Metal)
A. An element which can show +8 oxidation state
Mn
B. 3d block element that can show upto +7
oxidation state
C. 3d block element with highest melting point
12
84 Chromium – plated steel is a material of
popular use. During its process of manufacture, the effluent contains
chromate and cyanide ions as impurities. After these are chemically removed, carbon dioxide and salt (sodium chloride) still remain as
impurities. This salt solution is purified electrolytically by adding carbonaceous matter which acts as:
A. a microcell
B. an electrode
c. a cathode
D. a salt absorber
12
85 The size of ( N b ) is very similar to:
A. ( L a )
в. ( H f )
c. ( T a )
D. ( W )
12
86 Assertion
In any transition series, the magnetic
moment of ( M^{2+} ) ion first increases and
then decreases.
Reason
In any transition series, the number of unpaired electrons first increases, afterwards decrease
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
87 Which element can show ( +2,+3,+4+6 )
and +7 oxidation states?
A . cr
в. мп
( c cdot c_{0} )
D.
12
88 The electronic configuration of the first artificial element:
A ( cdot 4 f^{4} 5 d^{1} 6 s^{2} )
B . ( 4 f^{1} 5 d^{4} 6 s^{2} )
c. ( 5 f^{4} 6 d^{1} 7 s^{2} )
D. ( 5 f^{3} 6 d^{1} 7 s^{2} )
12
89 (a) What is Lanthanoid contraction?
(b) What are Interstitial compounds? Give an example.
(c) Calculate the ‘Spin only’ magnetic moment of ( M_{(a q)}^{2+} ) ion ( (Z=29) )
12
90 Lanthanides and actinides are
recognised as:
A. ( s ) – block elements
B. ( d ) -block elements
c. ( f ) -block elements
D. ( p ) -block elements
12
91 In acidic medium, ( boldsymbol{H}_{2} boldsymbol{O}_{2} ) changes
( C r_{2} O_{7}^{-2} ) to ( C r O_{5} ) which has two ( (-O- )
( O-) ) bonds oxidation state of ( C r ) in
( boldsymbol{C r} boldsymbol{O}_{5} ) is:
( A cdot+5 )
( B cdot+3 )
( c cdot+6 )
D. -10
12
92 Which of the following lanthanoid ions is diamagnetic? (Atoms, ( C e= )
( mathbf{5 8}, boldsymbol{S m}=mathbf{6 2}, boldsymbol{E u}=mathbf{6 3}, boldsymbol{Y b}=mathbf{7 0} mathbf{)} )
A ( cdot Y b^{2} )
в. ( C e^{2} )
( mathrm{c} cdot mathrm{Sm}^{2+} )
D. ( E u^{2} )
12
93 Which metal can not be extracted by smelting process:
( A cdot P b )
B. Fe
( c cdot z n )
( D cdot A )
12
94 Which of the following arrangements does not represent the correct order of
the property stated against it? This question has multiple correct options
A ( cdot N i^{2+}<C o^{2+}<F e^{2+}<M n^{2+}: ) lonic size
B . ( C o^{3+}<F e^{3+}<C r^{3+}<S c^{3+}: ) Stability in aqueous solution
c. ( S c<T i<C r<M n ) : Number of oxidation states
D. ( V^{2+}<C r^{2+}<M n^{2+}<F e^{2+}: ) Paramagnetic
behaviour
12
95 Which of the following statement is
incorrect for ( K M n O_{4} ? )
A. It is used as antiseptic
B. It is an oxidising agent
C. It is used as bleaching agent in textile industries
D. It Is steak mole allotted amorphous substance
12
96 Which of the following weights less when weighted in magnetic field?
A. ( S r C l_{3} )
в. ( F e C l_{3} )
c. ( T i C l_{3} )
D. ( V C l_{3} )
12
97 Eu SAD
ation reactions?
Q.8 Which of the following reactions are disproportionation read
(1) Cu- Cu2+ + Cu
(ii) 3MnO2 + 4H 2 Mn0Z + MnO2 + 2H20
(iii) 2KMnO,- KMnO4 + MnO2 + 02
(iv) 2MnO2 + 3Mn2+ + 2H20 5 MnO2 + 4H*
(a) (1)
(b) (i), (ii) and (iii) (c) (ii), (iii) and (iv) (d) (i) and (i
12
98 Represent the structure of dichromate
ion.
12
99 In dilute alkaline solution ( M n O_{4}^{-} )
changes to:
A ( cdot M n O_{4}^{2} )
в. ( M n O_{2} )
c. ( M n_{2} O_{3} )
D. ( M n O )
12
100 Which of the following ion is more paramagnetic?
A ( cdot L a^{3+}(Z=57) )
B . ( L u^{3+}(Z=71) )
( mathbf{c} cdot Y b^{3+}(Z=70) )
D. ( S m^{3+}(Z=62) )
12
101 The compound of vanadium has
magnetic moment of ( 1.73 B ). The vanadium chloride has the formula:
A ( cdot V C l_{2} )
в. ( V C l_{3} )
c. ( V C l_{4} )
D. ( V C l_{5} )
12
102 edium acidic in oxidation reactions of
0.21 Why is HCL not used to make the medium acidic in oxidati
KMnO, in acidic medium?
(a) Both HCl and KMnO, act as oxidising agents
(b) KMnO, oxidises HClinto Cl, which is also an oxidising agent
(c) KMnO4 is a weaker oxidising agent than HCI
(d) KMnO4 acts as a reducing agent in the presence of HCI
ution monotions of KMnO, in acidic
le
12
103 Most copper ( (I) ) compounds are found to be colourless. This is due to
A. presence of low oxidation state of copper
B. completely filled d-level in ( C u(I) )
c. diamagnetic nature of the compound
D. high polarizability of ( C u(I) ) ion
12
104 Show with balanced equations what happens when the following are mixed:
potassium permanganate interacts with manganese dioxide in the
presence of potassium hydroxide.
( mathbf{A} cdot 2 K M n O_{4}+4 K O H+M n O_{2} rightarrow 3 K_{2} M n O_{4}+2 H_{2} O )
B. ( 3 K M n O_{4}+4 K O H+M n O_{2} rightarrow 4 K_{2} M n O_{4}+2 H_{2} O )
c. ( 3 K M n O_{4}+3 K O H+M n O_{2} rightarrow 3 K_{2} M n O_{4}+2 H_{2} O )
D. None of these
12
105 Write the general electronic
configuration of lanthanoids. What are
transuranic elements?
12
106 Which complex is more stable between
( left[boldsymbol{F e}(boldsymbol{C N})_{6}right]^{4-} ) and ( left[boldsymbol{F e}(boldsymbol{C N})_{6}right]^{3-} ? )
12
107 Select correct statement(s).
This question has multiple correct options
A. Stabilities of variable oxidation states can be explained by standard electrode potential
B. ( C r^{2+} ) is unstable and ( C r^{3+} ) is stable in aqueous solution
C ( cdot F e^{2+} ) is stable and ( F e^{3+} ) is unstable is aerated water
D. All of the above
12
108 ( ” F e^{3+} ) is more stable than ( F e^{2+} )
Answer whether the above statement is
true or false.
If true enter 1 , else enter 0 .
12
109 Among the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?
A ( cdot(n-1) d^{8} n s^{2} )
B . ( (n-1) d^{8} n s^{1} )
c. ( (n-1) d^{5} n s^{text {। }} )
D. ( (n-1) d^{5} n s^{2} )
12
110 The highest possible oxidation states of uranium and plutonium, respectively,
are:
A .6 and 4
B. 7 and 6
c. 4 and 6
D. 6 and 7
12
111 Q. 63 Assertion (A) The highest oxidation state of osmium is +8.
Reason (R) Osmium is a 5d-block element.
be correct
y
12
112 When hydrogen peroxide is treated with
a cold acidified ( boldsymbol{K}_{mathbf{2}} boldsymbol{C r}_{mathbf{2}} boldsymbol{O}_{mathbf{7}} ) solution
containing ether, blue colour is obtained. This is due to:
A. perchromic acid
B. potassium chromate
c. chromium sulphate
D. chromium trioxide
12
113 Identify a ‘Chemical twin’ among the followings.
( mathbf{A} cdot Z r-T a )
B. ( N b-T c )
c. ( H f-R e )
D. ( N b-T a )
12
114 Which of the following properties of Zr and Hf can be explained due to lanthanide contraction?
A. Radius of Zr and Hf is same
B. Their EN is same
C. Their position in periodic table
D. All
12
115 Beryllium resembles Aluminium in properties. This is mainly due to:
A . equal electro negativity values of elements
B. equal atomic volumes of the elements
c. equal electron affinity
D. equal nuclear charges in their atoms
12
116 Observe the following statements.
1. Lanthanides actively participate in chemical reactions.
2. The basic nature of hydroxides of
lanthanides increases from ( L a(O H)_{3} )
to ( L u(O H)_{3} )
3. Lanthanides do not form coordinate
compounds as readily as d-block metals.
The correct statements are:
A. ( 1,2 & 3 )
В. 183
( c cdot 1 & 2 )
D. 2 & 3
12
117 The catalytic activity of transition metals and their compounds is ascribed mainly to:
A. their unfilled d-orbitals
B. their ability of adopt variable oxidation states
c. their chemical reactivity
D. their magnetic behaviour
12
118 Question 26. Indicate the steps in the preparation of:
(i) K2Cr2O from chromite
(ii) KMnO4 from pyrolusite ore (MnO2)
12
119 The Lanthanoid contraction refers to:
A. valence electrons of the Lanthanide series
B. ionic radius of the series
C . the density of the series
D. nuclear mass of the series
12
120 Select correct order of sizes of different
species.
( mathbf{A} cdot Z r=H f ; N b=T a ; F e=C o=N i )
B ( cdot Z r^{4+}<Z r ; N b^{3+}<T a^{3+}, F e^{3+}<F e^{2+}<F e )
( mathbf{c} cdot Z r^{4+}=H f^{4+} ; N b^{3+}=T a^{3+} ; F e<C o<N i )
D. ( Z r^{4+}<H f^{4+} N b^{3+}=T a^{3+}, N i<C u<C o )
12
121 In the dichromate dianion, the nature of
bonds are:
A. four equivalent ( C r-O ) bonds
B. six equivalent ( C r-O ) bonds and one ( O-O ) bond
C . six equivalent ( C r-O ) bonds and one ( C r-C r ) bond
D. six non-equivalent ( C r-O ) bonds
E. six equivalent ( C r-O ) bonds and one ( C r-O-C r )
bond
12
122 The lanthanides contraction refers to:
A. ionic radius of the series
B. valence electrons of the series
c. the density of the series
D. electronegativity
12
123 Assertion
To a solution of potassium chromate, if
a strong acid is added, it changes its color from yellow to orange.
Reason
The color change is due to the change in
oxidation state of potassium chromate.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Assertion is incorrect but Reason are correct.
12
124 Which one is classified as a
condensation polymer?
A. Dacron
B. Neoprene
c. Teflon
D. None of these
12
125 The aqueous solution of the salt will
colored in the case of:
This question has multiple correct options
( mathbf{A} cdot Z nleft(N O_{3}right)_{2} )
в. ( operatorname{LiNO}_{3} )
( mathrm{c} cdot mathrm{Co}left(mathrm{NO}_{3}right)_{2} )
D. ( C r C l_{3} )
12
126 Assertion
The number of unpaired electrons in the
following gaseous ions:
( M n^{3+}, C r^{3+}, V^{3+} ) and ( T i^{3+} ) are 4,3,2
and 1 respectively.
Reason
Among these ( mathrm{Cr}^{3+} ) is most stable in
aqueous solution.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Assertion is incorrect but Reason is correct
12
127 Assertion
La’should be the ( f ) -block element
according to Aufbau principle.
Reason
57 th electron exceptionally enters into
the ( 5 d ) -orbital.

Read the above assertion and reason
and choose the correct option regarding
¡t.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Assertion is incorrect but Reason are incorrect

12
128 Identify ( boldsymbol{A}, boldsymbol{B}, boldsymbol{C}, boldsymbol{D}, boldsymbol{E}, boldsymbol{F}, boldsymbol{G} )
( mathbf{K}_{2} mathbf{C r}_{2} mathbf{O}_{7} stackrel{mathbf{K O H}}{longrightarrow}(mathbf{A}) frac{mathbf{P} mathbf{b}left(mathbf{C H}_{3} mathbf{C O O}right)_{2}}{mathbf{C H}_{3} mathbf{C O O H}}>(mathbf{B}) )
( mathbf{N H}_{4} mathbf{C l} )
( (mathrm{C}) stackrel{Delta}{longrightarrow}(mathrm{D})+(mathrm{E}) )
(gas) (green) ( frac{|mathbf{A}|, Delta}{mid} )
(F) (metal) ( +(G) ) oxide
12
129 Explain actinoid contraction. 12
130 Knowing that the chemistry of lanthanoids ( (L n) ) is dominated by its
+3 oxidation state, which of the
following statements is incorrect?
A. The ionic size of ( L n(I I I) ) decrease in general with increasing atomic number
B. ( L n(I I I) ) compounds are generally colourless
c. ( L n(I I I) ) hydroxide are mainly basic in character
D. Because of the large size of the ( L n(I I I) ) ions the bonding in its compound is predominantly ionic in character
12
131 Explain : When ( M n(O H)_{2} ) is made by adding an alkali to a solution
containing ( M n^{2+} ) ions, the ppt quickly darkens, and eventually goes black
A. The black colour is due to the manganese (VI) oxide ( M n_{2} O_{3} )
B. The black colour is due to the manganese (VI) oxide ( M n O_{2} )
C. The black colour is due to the manganese (VI) oxide ( M n_{2} O_{5} )
D. None of these
12
132 State the number of unpaired electrons
in ( N i^{2+}: )
( A cdot O )
B. 2
( c cdot 4 )
D. 8
12
133 Which of the following group contains coloured ions?
1. ( boldsymbol{C} boldsymbol{u}^{+} )
2. ( boldsymbol{T} boldsymbol{i}^{4+} )
3. ( C o^{2+} )
4. ( boldsymbol{F} boldsymbol{e}^{2+} )
A .1,4
в. 3,4
c. 2,3
D. 1,2
12
134 Ammonia will not form complex with:
A ( cdot A g^{2} )
B. ( P b^{2} )
( c cdot C u^{2} )
D. ( C d^{2} )
12
135 Acidified ( K_{2} C r_{2} O_{7} ) solution turns
green when ( N a_{2} S O_{3} ) is added to it. This is due to the formation of:
A ( cdot C r O_{4}^{2-} )
В ( cdot C r_{2}left(S O_{3}right)_{3} )
( mathrm{c} cdot mathrm{CrSO}_{4} )
D ( cdot C r_{2}left(S O_{4}right)_{3} )
12
136 Cerium ( (Z=58) ) is an important
member of lanthanides. Which of the
following statements about cerium is
correct?
A. The common oxidation states of cerium are +3 and +4
B. The +3 oxidation states of cerium is more stable than the +4 state
c. The +4 oxidation states of cerium is not known in solutions
D. Cerium (IV) acts as an oxidising agent.
12
137 The common oxidation state shown by Europium in their compounds is:
( A cdot+1 )
( B cdot+3 )
( c cdot+5 )
( D cdot+6 )
12
138 Fourteen elements following
Lanthanum are called Lanthanoids:
(a) What is Lanthanoid contraction?
Give reason for it.
(b) ( K M n O_{4} ) is a purple coloured
crystal and it acts as an oxidant. How
will you prepare ( boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4} ) from ( boldsymbol{M} boldsymbol{n} boldsymbol{O}_{2} ? )
12
139 5f series elements are known
as
A. Lanthanides
B. Representative elements
c. Transition elements
D. Actinides
12
140 Which of the following is not the
configuration of Lanthanoid?
( mathbf{A} cdot[X e] 4 f^{10} 6 s^{2} )
B ( cdot[X e] 4 f^{1} 5 d^{1} 6 s^{2} )
( mathbf{c} cdot[X e] 4 f^{14} 5 d^{10} 6 s^{2} )
( mathbf{D} cdot[X e] 4 f^{7} 5 d^{1} 6 s^{2} )
12
141 Which of the following oxidation state is not shown by Manganese?
( A cdot+1 )
B. +2
( c cdot+4 )
D. +7
12
142 ( L n^{3+}( ) trivalent lanthanides ions) have
( E C )
A ( cdot[X e] 4 f^{1} ) to ( [X e] 4 F^{14} )
B . ( [X e] 4 d^{1} 4 f^{1} ) to ( [X e] 4 d^{1} 4 F^{14} )
( mathbf{c} cdot[X e] 4 d^{2} 4 f^{0} ) to ( [X e] 4 d^{1} 4 F^{1} )
D ( cdot[X e] 4 f^{0} ) to ( [X e] 4 F^{1} )
12
143 The element with the electronic
configuration ( [boldsymbol{X} boldsymbol{e}] boldsymbol{4} boldsymbol{f}^{14} boldsymbol{5} boldsymbol{d}^{1} boldsymbol{6} boldsymbol{s}^{2} ) is a
A. representative element
B. transition element
c. actinide element
D. Lanthanides element
12
144 Q. 44 Explain why does colour of KMnO, disappear when oxalic acid is added
to its solution in acidic medium?
12
145 Explain briefly the cause of Lanthanoid
contraction
12
146 Which of the following Lanthanoid is radioactive?
A. Cerium
B. Promethium
c. Thulium
D. Lutetium
12
147 Question 22. Mention the type of compounds formed when small atom
like H, C and N get trapped inside the crystal lattice of transition metak
Also give physical and chemical characteristics of these compounds.
12
148 When ( M n O_{2} ) is fused with ( K O H, ) a
coloured compound is formed. The product and its colour is:
A ( cdot K_{2} M n O_{4}, ) green
B. ( K M n O_{4} ), purple
c. ( M n_{2} O_{3} ), brown
D. ( M n_{3} O_{4} ), black
12
149 Maximum oxidation state exhibited by
lanthanides is:
( A cdot+1 )
B. +2
( c cdot+3 )
D. +4
12
150 Which of the following metals are present in Devarda alloy?

This question has multiple correct options
A. ( C u )
в. ( A l )
( c cdot Z n )
D. ( A g )

12
151 The colour of Lanthanoids and Actinoids
is due to:
A. s-ftransitions
B. p-f transitions
c. d-f transitions
D. f-f transitions
12
152 (i) With reference to structural
variability and chemical reactivity, write the difference between
lanthanoids and actinoids.
(ii) Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state
(iii) Complete the following equation:
[
M n O_{4}^{-}+8 H^{+}+5 e^{-} rightarrow
]
(iv) Out of ( M n^{3+} ) and ( C r^{3+}, ) which is
more paramagnetic and why? (atomic number : ( M n=25, C r=24) )
12
153 Lanthanoids are:
A. 14 elements in the seventh period left ( atomic no. ( =90 ) to ( 103 text { right }) ) that are filling ( 5 f ) sublevel
B. 14 elements in the sixth period left ( atomic no. 58 to 71 right ) that are filling ( 4 f ) sublevel
C. 14 elements in the seventh period left ( atomic no. ( =58 ) to ( 71 text { right }) ) that are filling ( 4 f ) sublevel
D. 14 elements in the sixth period left ( atomic no. 90 to ( 103 text { right }) ) that are filling ( 4 f ) sublevel
12
154 Lanthanoids are characterized by the filling of the:
A. penulimate 4f energy level
B. antepenultimate 4f energy level
c. penultimate 3f energy level
D. antepenultimate 3f energy level
12
155 The electronic configuration of actinides cannot be predicted with
degree of certainty because of :
A. small energy difference between 5f and 6d levels
B. overlapping of inner orbitals
C. free movement of electrons over all the orbitals
D. none of the above
12
156 Larger number of oxidation states are
exhibited by the actinides than those by lanthanoids, the main reason
being
A. more energy difference between 5 f and 6d than between 4 f and 5 d orbital
B. more reactive nature of the actinoids than the lanthanoids
c. ( 4 f ) orbitals more diffused than the 5 orbital
D. lesser energy difference between 5 fand 6 than between ( 4 mathrm{f} ) and ( 5 mathrm{d} ) orbital
12
157 20. Cro, is the oxidation product of Cro, using H,O.. H
many (0 – Cr – O) bonds are there in it?
12
158 When ( K M n O_{4} ) reacts with ( H_{2} O_{2} ) in acidic medium then which of the
following is formed?
( mathbf{A} cdot M n^{+2} )
B. ( M n^{+7} )
c. ( M n O_{2} )
D. ( M n_{2} O_{3} )
12
159 Magnetic moment of ( left[boldsymbol{C u}left(boldsymbol{N} boldsymbol{H}_{3}right)_{4}right]^{2+} ) ion
is?
A ( cdot 1.414 )
B. 1.73
c. 2.23
D. 2.38
12
160 The colourless species is (are):
A . VCl
B. voso ( _{4} )
( c cdot ) Nas vo ( _{4} )
( D cdotleft[Vleft(H_{2}right)_{6}right] S O_{4} cdot H_{2} O )
12
161 Which group elements exhibits highest densities?
A. IIIB
в. Iv
c. vı
D. VIIIB
12
162 The Lanthanide contraction relates to:
A. oxidation states
B. magnetic state
c. atomic radius
D. valence electrons
12
163 0. 20 Altho
20 Although zirconium belongs to 4d transition series and hatniun
to 5d
transition series even then they show similar physical and cheme
properties because ……..
(a) both belong to d-block
(b) both have same number of electrons
(c) both have similar atomic radius
(d) both belong to the same group of the Periodic Table
e ndienio vodi
12
164 We use ( Z n O ) in paints instead of ( P b^{2+} )
salts.
If true enter 1 , else enter 0 .
12
165 Iron is in +2 oxidation state in:
This question has multiple correct options
( mathbf{A} cdot N a_{2}left[F e(C N)_{5} N Oright] )
( mathbf{B} cdotleft[F eleft(H_{2} Oright)_{5} N Oright] S O_{4} )
( mathbf{c} cdot K_{3}left[F e(C N)_{6}right] )
( mathbf{D} cdot K_{4}left[F e(C N)_{6}right] )
12
166 What is the atomic number of the
element with ( M^{2+} ) ion having electronic
configuration ( [boldsymbol{A} boldsymbol{r}] boldsymbol{3} boldsymbol{d}^{8} ? )
A . 25
B . 28
c. 27
D. 26
12
167 15 The magnetic moment is associated with its spin angular momentum and
orbital angular momentum. Spin only magnetic moment value of Cror ion
(a) 2.87 BM
(c) 3.47 BM
(b) 3.87 BM
(d) 3.57 BM
12
168 Which of the following arrangments does not represent the correct order of
the property stated against it?
(1) ( V^{2+}<C r^{2+}<M n^{2}<F e^{2+} )
paramagnetic behaviour
(2) ( N i^{2+}<C o^{2+}<F e^{2+}<M n^{2+} )
ionic size
(3) ( C o^{3+}<F e^{3+}<C r^{3+}<S c^{3+} )
stability in aqueous solution
(4) ( S c<T i<C r<M n: ) number of
oxidation states
12
169 Following elements do not show the properties characteristic of d-block
elements:
A. ( C u, A g, A u )
в. ( Z n, H g, C d )
c. ( S c, T i, V )
D. Fe, Co, Ni
12
170 Due to the loss of the following electrons, transition metal shows variable valency:
( A cdot n s )
B. ns and np
( c cdot(n-1) d )
D. (n-1)d and ns
12
171 It is sometimes necessary to remove colouring matter contained as an impurity in glass. Glass is decolourised by:
A. wood charcoal
B. manganese dioxide
c. bleaching powder
D. hydrogen
12
172 Transuranic elements begin with:
( A cdot N p )
в. ( mathrm{cm} )
c. Pu
D.
12
173 Write balanced chemical equations for the reduction reaction of lead (II) oxide
by carbon.
12
174 ( C u S O_{4} cdot 5 H_{2} O ) is blue in colour
whereas anhydrous ( C u S O_{4} ) is
colourless.Why?
12
175 f the following ion is coloured enter 1
else enter 0
( M n^{2+} )
12
176 Question 8. What are the characteristics of the transition elements and
why are they called transition elements? Which of the d-block elements
may not be regarded as the transition elements?
Transition elements are placed between s and p block elements in the
Period Table and have incompletely filled d-orbital in neutral state or in
any of the oxidation states.
12
177 Question 20. Compare the chemistry of actinoids with that of the
lanthanoids with special reference to
(i) electronic configuration (ii) atomic and ionic sizes
(iii) oxidation state
(iv) chemical reactivity
12
178 The composition of mischmetal is:
A. ( 5 % ) of a lanthanoid metal, ( 95 % ) of iron and traces of ( S, C, C a ) and ( A l )
B. ( 95 % ) of an actinoid metal, ( 5 % ) of iron and traces of ( S, C, C a ) and ( A l )
C. ( 95 % ) of a lanthanoid metal, ( 5 % ) of iron and traces of ( S, C, C a ) and ( A l )
D. ( 95 % ) of a transition metal, ( 5 % ) of iron and traces of ( S, C, C a ) and ( A l )
12
179 Oxidation state of Mg in chlorophyll is:
( A cdot+2 )
B. +6
( c cdot+3 )
( D cdot+4 )
12
180 Differentiate Lanthanides and
Actinides.
12
181 Which element among the Lanthanides has the smallest atomic radius?
A. Cerium
B. Lutetium
c. Europium
D. Gadolinium.
12
182 Among ‘3d’ series of elements, the one
that cannot liberate hydrogen with dil
acids is:
A. cu
B. Sç
( c cdot z n )
D. Mn
12
183 Lanthanoid contraction is applicable on which group of the following element
set?
This question has multiple correct options
A ( . Z n, ) Cd, ( H g )
в. ( T i, Z r, H f )
c. ( S c, Y, L a )
D. ( C u, A g, Z n )
E. ( V, N b, T a )
12
184 Question 15. While filling up of electrons in the atomic orbitals, the
4s-orbital is filled before the 3d-orbital but reverse happens during the
ionisation of the atom. Explain why?
12
185 Question 16. Describe the preparation of potassium permanganate.
How does the acidified permanagate solution react with (i) iron (II) ions
(ii) SO, and (iii) oxalic acid
Write the ionic equations for the reactions.
In acidic medium KMnO4 is a good oxidising agent. It oxidises
(1) Fe2+ into Fe3+
(11) SO, into so
(iii) (COOH), into Co, and itself gets reduced to Mn2+ ion.
12
186 Write general configuration of
inner transition element. what is the
important of the element?
12
187 In which case there is change in
oxidation number:
A . Aqueous solution of ( C r O_{4}^{2-text { – – is acidified }} )
B. ( S O_{2} ) gas is passed into ( C r_{2} O_{7}^{2} )
c. ( C r_{2} O_{7}^{2-} ) solution is made alkaline
D. ( C r O_{2} C l_{2} ) is dissolved in ( N N a O H )
12
188 In which state, the lanthanide ions are
coloured?
This question has multiple correct options
A. Solid
B. Gas
c. Aqueous
D. Not coloured
12
189 Which of the following ions is coloured in aqueous solution?
¡) ( C u^{2+} )
ii) ( boldsymbol{C} boldsymbol{u}^{mathbf{1}+} )
12
190 A compound of vanadium possesses a
magnetic moment of 1.73 BM. The oxidation state of vanadium in this
compounds is :
A
B. 2
( c cdot 4 )
D. can not be predicted
12
191 The main reason for larger number of
oxidation states exhibited by the
actinoids than the corresponding
lanthanoids, is:
A. the lesser energy difference between ( 5 f ) and ( 6 d ) orbitals than between ( 4 f ) and ( 5 d ) orbitals
B. more energy difference between 5 fand 6 d orbitals than between ( 4 f ) and ( 5 d ) orbitals
C . greater reactive nature of the actinoids than the lanthanoids
D. larger atomic size of actinoids than the lanthanoids
12
192 Question 10. What are the different oxidation states exhibited by
lanthanoids?
12
193 Most common oxidation states shown
by cerium are:
( mathbf{A} cdot+2,+4 )
B. +3,+4
( mathrm{c} cdot+3,+5 )
D. +2,+3
12
194 The actinoids which shows +7 oxidation
state are:
A. U, NP
B. Pu, Am
c. Np, Pu
D. ( A m, C m )
12
195 Mohr salt, ( boldsymbol{F} boldsymbol{e} boldsymbol{S} boldsymbol{O}_{4} cdotleft(boldsymbol{N} boldsymbol{H}_{4}right)_{2} cdot boldsymbol{S} boldsymbol{O}_{4} )
( 6 H_{2} O, ) is preferred over ( F e S O_{4} cdot 7 H_{2} O )
for standardization of ( K M n O_{4} ) solution
because:
A. Mohr’s salt is a double salt wile ferrous sulphate
B. Mohr’s salt is not hygroscopic but ( F e S O_{4} cdot 7 mathrm{H}_{2} mathrm{O} ) is hygroscopic.
c. Moh’sr salt contains only ferrous ions whereas ferrous sulphate contains some ferric ions
D. Mohr’s salt solution can be titrated even in the absence of ( H_{2} S O_{4} )
12
196 Which of the following ions having following electronic structure would have maximum magnetic moment?
A ( cdot 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} )
B . ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} )
( mathbf{c} cdot 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{7} )
D cdot ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9} )
12
197 Question 10. Actinoid contraction is greater from element to element
than lanthanoid contraction?
() General electronic configuration of lanthanoids and actinoids are
41-14500-6s2 and 5f-14600-17s respectively.
(ii) Shielding effect of 4f-electrons is more than that of 5f-electrons.
12
198 Which of the following element exhibits maximum oxidation state?
A. Mn
B. co
c. ( mathrm{Fe} )
D. zn
12
199 The starting and ending elements of actinides are respectively:
( mathbf{A} cdot T h ) and ( L u )
B. ( T h ) and ( L r )
c. ( A c ) and ( L u )
D. ( A c ) and ( L r )
12
200 Among the following, the species that is both paramagnetic and coloured is :
B. ( left[T i C l_{6}right]^{2-} )
( mathbf{c} cdotleft[V O_{4}right]^{3} )
D. ( operatorname{Cr} mathrm{O}_{2} mathrm{Cl}_{2} )
12
201 An aqueous solution containing ( boldsymbol{V}^{boldsymbol{x}} ) ion has magnetic moment equal to ( sqrt{15} B M . ) Therefore, the ( x ) is:
( A cdot 5 )
B. 2
( c .3 )
D. 4
12
202 Which of the following metals is used in ceramic applications? This question has multiple correct options
A. Cerium
B. Neodymium
c. Praseodymium
D. None of these
12
203 The equilibrium established when
( H g C l_{2} ) is shaken with an excess of ( H g )
is:
( mathbf{A} cdot H g^{2+}+H g rightleftharpoons 2 H g^{+} )
B. ( H g^{2+}+H g_{(l)} rightleftharpoons H g_{2}^{2+} )
C. ( H g+2 H g^{2+} rightleftharpoons H g^{2+}+2 H g^{+} )
D. no equilibrium is established
12
204 Transition metals are often para
magnetic owing to
A. high melting point and boiling point
B. the presence of vacant orbitals
C. the presence of unpaired electrons
D. malleability and ductility
12
205 ( (n-1) d^{10} n s^{2} ) is the general electronic
configuration of:
A. ( F e, C o, N i )
в. ( C u, A g, A u )
c. ( Z n, ) Cd ( , H g )
D. ( S e, Y, L a )
12
206 Maximum oxidation state exhibited by osmium is:
( A cdot+8 )
B. +7
( c cdot+6 )
D. + 5
12
207 The correct order of the spin-only magnetic moment of metal ions in the
following low spin complexes, ( left[boldsymbol{V}(boldsymbol{C N})_{6}right]^{4-},left[boldsymbol{F e}(boldsymbol{C} boldsymbol{N})_{6}right]^{4-} )
( left.left[boldsymbol{R u}left(boldsymbol{N} boldsymbol{H}_{3}right)_{6}right]^{3+}, text { and }left[boldsymbol{C r}(boldsymbol{N} boldsymbol{H})_{3}right)_{6}right]^{2+}, ) is:
A ( cdot V^{2+}>C r^{2+}>R u^{3+}>F e^{2+} )
B . ( V^{2+}>R u^{3+}>C r^{2+}>F e^{2+} )
c. ( C r^{2+}>V^{2+}>R u^{3+}>F e^{2+} )
D. ( C r^{2+}>R u^{3+}>F e^{2+}>V^{2}+ )
12
208 The ratio of number of exchange pairs
present in ( d^{9} ) and magnetic moment of Cr in B.M. is:-
( A cdot frac{2}{sqrt{3}} )
B. ( frac{2 sqrt{3}}{3} )
c. ( frac{2 sqrt{3}}{4} )
D. ( frac{16}{sqrt{35}} )
12
209 Describe the preparation of potassium dichromate from iron chromite ore.
What is the effect of increasing pH on a solution of potassium dichromate?
12
210 Lanthanoid contraction is due to
increase in:
A. atomic number
B. effective nuclear charge
c. atomic radius
D. valence electrons
12
211 Complex forming ability will be minimum in :
A. actinides
B. lanthanides
c. transition metals
D. it will be almost same in all the three
12
212 ( C r O_{5} ) forms addition compound with
pyridine in the ethereal layer. The addition product is pentagonal pyramidal.
A. True
B. False
12
213 Which of the following oxidation state is common for all lanthanides?
( A cdot+2 )
B. +3
( c cdot+4 )
D. +5
12
214 ( mu=sqrt{15} ) is true for the pair:
A ( cdot C o^{+2}, C r^{+3} )
B. ( F e^{+2}, C r^{+3} )
c. ( F e^{+3}, C r^{+2} )
D. ( M n^{+2}, F e^{+2} )
12
215 Question 34. Compare the general characteristics of the first series of
the transition metals with that of the second and third series metals in the
respective vertical columns. Give special emphasis on the following
points:
(1) Electronic configuration
(i) Oxidation states
(iii) Ionisation enthalpies
(iv) Atomic sizes
12
216 Which of the following catalysts is not correctly matched with the reaction?
A. Vanadium (V) oxide in contact process for oxidation of ( S O_{2} ) to ( S O_{3} )
B. Finely divided iron in Habers process in conversion of ( N_{2} ) and ( H_{2} ) to ( N H_{3} )
C. ( P t C l_{2} ) catalyzes the oxidation of ethyne to ethanal in the Wacker process
D. Ni in presence of hydrogen for conversion of vegetable oil to ghee
12
217 Which of the following is not an actinoid
( ? )
( A cdot A m )
B. ( mathrm{cm} )
( c . F m )
D. Tm
12
218 Give the composition of the following alloys:
(a) German silver
(b) Brass
12
219 ( left(N H_{4}right)_{2} C r_{2} O_{7} ) (Ammonium
dichromate) is used in fire works. The
green coloured powder blown in air is :
A. ( C r_{2} O_{3} )
в. ( C r O_{2} )
( mathrm{c} cdot mathrm{Cr}_{2} mathrm{O}_{4} )
D. ( operatorname{Cr} mathrm{O}_{3} )
12
220 Potassium dichromate can be
converted to potassium chromate by adding:
( mathbf{A} cdot K O H )
в. Conc.H( _{2} )SO( _{4} )
c. ( N H_{4} O H )
D. ( C H_{3} ) СООН
12
221 Which of the following form an alloy?
A. ( Z n+P b )
в. ( F e+H g )
c. ( P t+H g )
D. ( F e+C )
12
222 Which of the following statements for the reaction, is correct?
( N a_{2} C r O_{4}+H_{2} S O_{4} rightarrow )
A. It is a redox reaction in which green solution of ( left[C rleft(H_{2} Oright)_{6}right]^{+3} ) is produced.
B. one of the product is reaction has trigonal planar structure
c. Dimeric bridged tetrahedral metal ion is produced.
D. Dark blue color in obtained in reaction
12
223 Which of the following is coloured compound?
A. ( C u F_{2} )
в. ( C u I )
c. ( N a C l )
D. ( M g C l_{2} )
12
224 What happens when ( left(N H_{4}right)_{2} C r_{2} O_{7} ) is
heated?
12
225 Platinum, palladium and iridium are
called noble metals because:
A. Alfred Nobel discovered them
B. They are inert towards many common reagents
C. They are shining, lustrous and pleasing to look at
D. They are found in active state
12
226 Question 24. Calculate the number of unpaired electrons in the
following gaseous ions; Mnº+, Cr +, V+ and T13+. Which one of these is
the most stable in aqueous solution?
Write the electronic configuration of given ions to find the number of
unpaired electrons.
12
227 (a) Why Transition elements become
paramagnetic?
(b) Explain oxidization properties of potassium permanganate in acidic medium. (any four only)
12
228 An aqueous solution containing ( boldsymbol{H} boldsymbol{g}_{2}^{2+}, boldsymbol{H} boldsymbol{g}^{2+}, boldsymbol{P b}^{2+}, boldsymbol{F} boldsymbol{e}^{2+} ) is treated with
dil HCI. The cations that may be
precipitate are This question has multiple correct options
( mathbf{A} cdot H g_{2}^{2+} )
B. ( H g^{2+} )
( mathrm{c} cdot P b^{2} )
D. ( F e^{2} )
12
229 Transition elements does not show:
A. paramagnetism
B. colour
c. fixed valency
D. all of these
12
230 Question 13. The second and third rows of transition elements resemble
each other much more than they resemble the first row. Explain why?
12
231 Compound that is both paramagnetic and coloured is:
A. ( K_{2} C r_{2} O_{7} )
B. ( left(N H_{4}right)_{2}left[T i C I_{6}right] )
( c cdot v o s O_{4} )
D. ( K_{3}left[C u(C N)_{4}right] )
12
232 ( boldsymbol{C u} boldsymbol{S O}_{4} ) is paramagnetic while ( boldsymbol{Z} boldsymbol{n} boldsymbol{S} boldsymbol{O}_{4} )
is diamagnetic because:
A. ( C u^{2+} ) ion has ( 3 d^{9} ) configuration while ( Z n^{2+} ) ion has ( 3 d^{10} ) configuration
B. ( C u^{2+} ) ion has ( 3 d^{5} ) configuration while ( Z n^{2+} ) ion has ( 3 d^{6} ) configuration.
( mathrm{c} cdot mathrm{Cu}^{2+} ) has half filled orbitals while ( Z n^{2+} ) has fully filled orbitals
D. ( C u S O_{4} ) is blue in colour while ( Z n S O_{4} ) is white
12
233 Which one of the following elements has the highest number of unpaired electrons?
( mathbf{A} cdot_{25} M n )
в. ( _{24} mathrm{Cr} )
( mathbf{c} cdot_{96} C m )
( D cdot 26 F e )
12
234 (a) Given reasons for the following:
(i) ( M n^{3+} ) is a good oxidising agent
(ii) ( E_{M^{2+} / M}^{circ} ) values are not regular for
fist row transition metals (3 ( boldsymbol{d} ) series).
(iii) Although ( F ) is more electronegative than ( O ), the highest ( M n ) fluoride is
( M n F_{4}, ) whereas the highest oxide is
( boldsymbol{M} boldsymbol{n}_{2} boldsymbol{O}_{7} )
(b) Complete the following equations:
(i) ( 2 C r O_{4^{-}}^{2}+2 H^{+} rightarrow )
(ii) ( boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4} stackrel{boldsymbol{Delta}}{longrightarrow} )
12
235 What are ( boldsymbol{f} ) -block elements?
Distinguish between lanthanoid and
actinoid.
12
236 Assertion
Transition metals are weak reducing
agents.
Reason
Due to high heat of sublimation, high ionization energy and low ( boldsymbol{E}_{boldsymbol{R} . boldsymbol{P}}^{boldsymbol{0}} )
Read the above assertion and reason
and choose the correct option regarding
¡t.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
237 Number of moles of ( K_{2} C r_{2} O_{7} ) require
to reduce one mole of ( S n^{2+} ) ions is
( A cdot 1 / 3 )
B. 3
( c cdot 1 / 6 )
D. 6
12
238 Which element is a transition metal?
A. melting point in ( ^{circ} C-98 ; ) density in ( g / c m^{3}-1.0 ; ) colour of oxide – white
B. melting point in ( ^{circ} C-328 ; ) density in ( g / c m^{3}-11.3 ; ) colour of oxide – yellow
C. melting point in ( ^{circ} C-651 ); density in ( g / c m^{3}-1.7 ; ) colour of oxide – white
D. melting point in ( ^{circ} C ) – 1240; density in ( g / mathrm{cm}^{3}-7.4 ) colour of oxide – black
12
239 Many Lanthanoid elements are used to
prepare
A . ceramic materials
B. water softener
c. superconducting materials
D. enzyme catalysts
12
240 Across the lanthanide series, the basicity of the lanthanide hydroxides?
A. Increases
B. Decreases
c. First increase and then decrease
D. First decrease and then increase
12
241 The magnetic moment of a transition metal ion is ( sqrt{15} B M . ) Therefore, the number of unpaired electrons present in it is:
A . 4
B.
( c cdot 2 )
D. 3
12
242 In which compounds does vanadium
have an oxidation number of ( +4 ? )
A. ( N H_{4} V O_{2} )
B . ( K_{4}left[V(C N)_{6}right] )
( c cdot v o s O_{4} )
D. ( operatorname{Cr} mathrm{O}_{2} mathrm{Cl}_{2} )
12
243 Which one of the following forms a colourless solution in an aqueous medium?
[Atomic number ( boldsymbol{S c}=mathbf{2 1}, boldsymbol{T} boldsymbol{i}= )
( mathbf{2 2}, boldsymbol{V}=mathbf{2 3}, boldsymbol{C r}=mathbf{2 4}] )
( mathbf{A} cdot V^{3} )
в. ( C r^{3} )
( c cdot T i^{3} )
D. ( S c^{3} )
12
244 Pitch-Blende is the source of some
metals. Find the total No. of such metals
among these:
( [boldsymbol{H} boldsymbol{g}, boldsymbol{R} boldsymbol{a}, boldsymbol{U}, boldsymbol{T} boldsymbol{h}, boldsymbol{Z} boldsymbol{n}, boldsymbol{T} boldsymbol{c}] )
12
245 Which of the following is not an actinoid?
A. Carium( (Z=96) )
B. Californium(Z = 98)
c. Uranium( (Z=92) )
D. Terbium( ( Z=65 ) )
12
246 The nature of ( boldsymbol{F e}_{2} boldsymbol{O}_{3} ) is:
A . acidic
B. basic
c. amphoteric
D. none of these
12
247 Which represents correct comparison of
the stability of ions?
A. ( M n O_{4}^{-}<M n^{2+} )
B. ( C r^{2+}<C r^{3} )
c. ( C r O_{4}^{2-}<C r^{3+} )
D. All of these
12
248 A sulphate of a metal (M) on healing evolves two gases ( (mathrm{B}) ) and ( (mathrm{C}) ) and an oxide (D). Gas (B) turns acidified
dichromate paper green while gas ( (mathrm{C}) ) forms a trimer. Compound (D) forms a Lewis acid (E) with HCI (g).
If, the number of ( S ) -S bonds in trimer of
gas
(C) be ‘n’ and the number of
equivalent M-Cl bonds in one molecule of anhydrous (E) be ‘m’, Then, ( (m+n) ) is:
12
249 Which of the following has ( n s^{2} n p^{6} n d^{10} ) ( (n+1) s^{0} ) configuration?
A. ( P d )
в. ( A g^{+} )
c. ( C d^{+2} )
D. All of the above
12
250 Among the Lanthanoids, the one obtained by synthetic method is:
A . ( L u )
в. ( P r )
c. ( P m )
D. ( G d )
12
251 The actinoids exhibit more number of
oxidation states in general than the lanthanoids. This is because:
A. the ( 5 f ) orbitals are more buried than the ( 4 f ) orbitals
B. there is a similarity between 4 f and 5 f orbitals in their angular part of the wave function
c. the actinoids are more reactive than the lanthanoids
D. the 5 f orbitals extend further from the nucleus than the ( 4 f ) orbitals
12
252 Question 9. Explain why Cut ion is not stable in aqueous solutions 12
253 A solution of ( K M n O_{4} ) is reduced to
various products depending upon its pH. At pH ( 7 it gives a green solution (C)
( (A),(B) ) and ( (C) ) are :
A ( cdot(A)-M n^{2+},(B)-M n O_{2}(C)-M n O_{4}^{2-} )
B . ( (A)-M n O_{2},(B)-M n^{2+},(C)-M n O_{4}^{2} )
c. ( (A)-M n^{2+},(B)-M n O_{4}^{2-},(C)-M n O_{2} )
D. ( (A)-M n O_{4}^{2-},(B)-M n^{2+},(C)-M n O_{2} )
12
254 The actinide contraction is due to:
A. perfect shielding of ( 5 f ) election
B. imperfect shielding of ( 4 f ) election
C. imperfect shielding of ( 5 f ) electron
D. perfect shielding of ( 4 f ) election
12
255 ( A C r O_{4}^{2-} ) solution turns from yellow to another color upon addition of acid.
What is the another color?
A. Pink
B. Green
c. white
D. orange
12
256 (i) ( underset{boldsymbol{a} boldsymbol{q} cdot boldsymbol{s u s p e n s i o n}}{boldsymbol{B} boldsymbol{a} boldsymbol{C O}_{3}}+boldsymbol{N} boldsymbol{a}_{2} boldsymbol{C r} boldsymbol{O}_{4}+ )
( boldsymbol{A c O H} rightarrow underset{p p t}{boldsymbol{H}} )
(ii) ( boldsymbol{B a C O}_{3}+boldsymbol{N a}_{2} boldsymbol{C r} boldsymbol{O}_{4}+ )
aq.suspension
( boldsymbol{H} boldsymbol{C} boldsymbol{N} rightarrow underset{p p t}{boldsymbol{N}} )
Which is the correct option regarding the given reactions?
A. ( mathrm{M} ) and ( mathrm{N} ) are the same and characterized as ( B a C r O_{4} )
B. ( mathrm{M} ) is ( mathrm{BaCrO}_{4} ) and ( mathrm{N} ) stands for no precipitate
c. ( mathrm{M} ) is ( mathrm{BaCrO}_{4} ) and ( mathrm{N} ) is ( mathrm{BaCO}_{3} )
D. M stands for no precipitate and ( mathrm{N} ) is ( mathrm{BaCrO}_{4} )
12
257 by
0.46 A sole
16 A solution of KMnO, on reduction yields either a colourless solution or a
brown precipitate or a green solution depending on pH of the solution.
What different stages of the reduction do these represent and how are
they carried out?
12
258 Question 4. To what extent do the electronic configurations decide the
stability of oxidation states in the first series of the transition elements
Illustrate your answer with examples.
12
259 Filled
Q.53 Match the compounds elements given in Column I with uses given in
Column II.
SO
1.
Column 1
(Compound/element)
Lanthanoid oxide
Lanthanoid
Misch metall
Magnesium based alloy is constituent of
Mixed oxides of lanthanoids are employed
A.
B.
C
D.
E
2.
3.
4.
Column II
(Use)
Production of iron alloy
Television screen
Petroleum cracking
Lanthanoid metal + iron
Bullets
X-ray screen
6.
12
260 The magnetic moment of
( left[boldsymbol{C u}left(boldsymbol{N} boldsymbol{H}_{3}right)_{4}right]^{2+} ) was found to be 1.73 B.M.
The number of unpaired electrons in the complex is:
( A cdot O )
B.
( c cdot 2 )
( D cdot 3 )
12
261 Isotope of which metal is used in cancer therapy?
A . ( R a )
в. ( N i )
c. ( P_{o} )
D. ( C o )
12
262 Which of the following oxidation state is common for all lanthanides?
( A cdot+2 )
B. +3
( c cdot+4 )
D. +5
12
263 The pair, that referred as ‘chemical
twins’ is.
( A cdot A c, C f )
B. Hf, Ta
c. Tc, Re
D. La, Acc
12
264 ( F e^{3+} ) compounds are more stable than
( F e^{2+} ) compounds because:
A. ( F e^{3+} ) has smaller size than ( F e^{2+} )
B. ( F e^{3+} ) has ( 3 d^{5} ) configuration (half-filled)
C. ( F e^{3+} ) has higher oxidation state
D. ( F e^{3+} ) is paramagnetic in nature
12
265 Passivity of iron is due to formation of:
A. ( F e_{2} O_{3} )
в. ( F e_{3} O_{4} )
( mathrm{c} cdot mathrm{FeSO}_{4} )
D. none of these
12
266 The inner transition elements are the
elements in which last electrons enters
into:
( A cdot(n-1) ) d-orbitals
B. (n-2) f-orbitals
C. ( (n-1) ) d-orbitals and ( (n-1) ) f-orbitals
D. ( (n-1) ) d-orbitals and ns orbitals
12
267 Common oxidation state of Scandium
¡s/are:
( A cdot+4 )
B. +1
( c cdot+3 )
D. +4 and +1
12
268 Which of the following statement(s) is
(are) not correct with reference to
ferrous and ferric ions?
A ( cdot F e^{3+} ) gives brown colour with potassium ferricyanide
B. ( F e^{2+} ) gives blue ppt with potassium ferricyanide
C ( cdot F e^{3+} ) gives red colour with potassium sulphocyanide
D. ( F e^{2+} ) gives brown colour with potassium sulphocyanide
12
269 Ammonia forms a complex ion ( left[boldsymbol{C u}left(boldsymbol{N} boldsymbol{H}_{3}right)_{4}right]^{2+} ) with copper ions in
alkaline solutions but not in acidic
solutions. What is the reason for it?
A. Copper hydroxide is an amphoteric substance.
B. In acidic solutions, hydration protects copper ions.
C. In acidic solutions, protons coordinate with ammonia molecules forming ( N H_{4}^{+} ) ions and ( N H_{3} ) molecules are no longer available for co-ordination to metal ions.
D. In alkaline solutions, insoluble ( C u(O H)_{2} ) is precipitated out which is soluble in excess of any alkali
12
270 In which of the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other?
( mathbf{A} cdot T i^{+}, T i^{3+} )
B. ( C u^{+}, C u^{2+} )
c. ( C r^{+}, C r^{3+} )
D. None of these
12
271 There are 14 elements in actinoid series.
Which of the following elements does not belong to this series?
A. ( U )
в. ( N p )
( c . T m )
D. ( P m )
12
272 Which of the following belongs to the actinoids series of elements?
A. ( Y )
в. ( T a )
( c cdot U )
D. ( P )
12
273 Question 3. Why first ionisation enthalpy of Cr is lower than that of
Zn?
12
274 The colored complexes of the transition
elements have color because they:
A. have very high formation constants
B. absorb light of some visible wavelengths
C. absorb light of some ultraviolet wavelengths
D. have unpaired electrons
E. are soluble in water
12
275 Chlorine is liberated when we heat:
A. ( K M n O_{4}+N a C l )
В ( cdot P b_{2}left(N O_{3}right)_{4}+M n O_{2} )
c. ( K_{2} C r_{2} O_{7}+M n O_{2} )
D. ( K_{2} C r_{2} O_{7}+H C l )
12
276 Assertion
In 5 th period, an element with ( Z=57 ) is
followed by element ( Z=72 )
Reason
The intermediate elements are not
represented in the main body of the periodic table.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
277 The value of the magnetic moment of a
particular ion is 2.83 Bohr magneton. The ion is :
A ( cdot F e^{2} )
B. ( N i^{2} )
( mathbf{c} cdot M n^{2+} )
D. ( C o^{3} )
12
278 In the transition elements the incoming electron occupies ( [n-1] ) d sublevel in preference to
( A cdot n p )
B. ns
c. [n-1]d
D. ( [n+1] s )
12
279 Question 23. Which metal in the first series of transition metals exhibits
+1 oxidation state most frequently and why?
12
280 Write the ionic equation showing the oxidation of ( F e(I I) ) salt by acidified dichromate solution. 12
281 Salt of which of the elements are mostly
blue in colour?
A. cu
B. zn
c. ( mathrm{Fe} )
D. cr
12
282 Which of the following is not true about
transition metals?
A. They are diamagnetic substances
B. They are paramagnetic substances
C. They can form complexes
D. They can show variable oxidation states
12
283 The actinoids showing +7 oxidation
state are:
A. ( U, N p )
в. ( P u, A m )
c. ( N p, P u )
D. ( A m, C m )
12
284 What is correct order of size in each
pair given below?
( N b^{3+} ) and ( T a^{3+} )
A. ( N b^{3+}=T a^{3+} )
B . ( N b^{3+}T a^{3} )
D. None of these
12
285 The orange solution of ( boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7} ) turns
yellow on adding NaOH to it .If true enter
else 0
( A )
12
286 Iron sheets are covered with a layer of Zinc i.e., galvanized mainly to
A. harden the surface
B. increase the surface
c. prevent action of water only
D. prevent action of oxygen and water
12
287 Select the correct option, among ( boldsymbol{S} boldsymbol{c}(boldsymbol{I} boldsymbol{I} boldsymbol{I}), boldsymbol{T} boldsymbol{i}(boldsymbol{I} boldsymbol{V}), boldsymbol{P} boldsymbol{d}(boldsymbol{I} boldsymbol{I}) ) and ( boldsymbol{C} boldsymbol{u}(boldsymbol{I} boldsymbol{I}) )
ions.
A. All are paramagnetic
c. ( S c(I I I), T i(I V) ) are paramagnetic and ( P d(I I I), C u(I I) ) are diamagnetic
D. ( S c(I I I), T i(I V) ) are diamagnetic and ( P d(I I), C u(I I) ) are paramagnetic
12
288 Which of the following oxidation states
is the most common among the lanthanoids?
( A cdot 4 )
B. 2
( c cdot 5 )
D.
12
289 Compare the stability of +2 oxidation
state for the elements of the first
transition series.
12
290 Arrange ( C e^{3+}, L a^{3+}, P m^{3+}, ) and ( Y b^{3+} )
in increasing order of their ionic radius:
A ( cdot Y b^{3+}<P m^{3+}<C e^{3+}Y b^{3+}<P m^{3+}P m^{3+}<L a^{3+}<C e^{3+} )
D. none of these
12
291 The radius of ( L a^{3+} ) (Atomic number of ( boldsymbol{L} boldsymbol{a}=mathbf{5} mathbf{7}) ) is ( mathbf{1 . 0 6} boldsymbol{A} . ) Which one of the
following given values will be closest to
the radius of ( L u^{3+} ) (Atomic number of
( boldsymbol{L} boldsymbol{u}=mathbf{7} 1) ? )
A ( .1 .40 AA )
В. 1.06 А
c. ( 0.85 dot{A} )
D. 1.60 月
12
292 In the dichromate anion ( C r_{2} O_{7} )
A. all Cr- O bonds are equivalent
B. ( 6 mathrm{cr} ) – 0 bonds are equivalent
c. ( 3 mathrm{cr} ) -o bonds are equivalent
D. no bonds in ( C r_{2} O_{7} ) are equivalent
12
293 When ( mathrm{CO}_{2} ) is passed into aqueous
This question has multiple correct options
( mathbf{A} cdot mathrm{Na}_{2} mathrm{CrO}_{4} ) solution, its yellow colour changes to orange
B. ( mathrm{K}_{2} mathrm{MnO}_{4} ) solution, it disproportionates to ( mathrm{KMnO}_{4} ) and
( mathrm{MnO}_{2} )
( mathrm{C} cdot mathrm{Na}_{2} mathrm{Cr}_{2} mathrm{O}_{7} ) solution, its orange colour changes to green
D. ( mathrm{KMnO}_{4} ) solution, its pink colour changes to green
12
294 The basic character of the transition
metal monoxides follows the
(At. no. of ( boldsymbol{T} boldsymbol{i}=mathbf{2} 2, boldsymbol{V}=mathbf{2 3}, boldsymbol{C r}= )
( 24, F e=26) )
A ( . T i O>V O>C r O>F e O )
в. ( V O>C r O>T i O>F e O )
( mathrm{c} cdot mathrm{Cr} mathrm{O}>mathrm{VO}>mathrm{FeO}>mathrm{TiO} )
D. ( T i O>F e O>V O>C r O )
12
295 What is meant by lanthanoid contraction? The actinoid contraction is
grater than that of lanthanoid
contraction. Why?
12
296 Of the following metals, the most reactive metal is:
A . ( F e )
в. ( N i )
( c cdot P t )
D. ( A u )
12
297 The highest oxidation state of a transition metal is usually exhibited in its oxide and fluoride. 12
298 42. The lightest radioactive element
is
(1) deuterium
(3) tritium
(2) polonium
(4) uranium
12
299 The common oxidation state of
elements of lanthanide series is
( A cdot+1 )
( B cdot+3 )
( c cdot+4 )
( D cdot+6 )
12
300 Choose the correct alternative:
(a) Alloys of metals usually have (greater/less) resistivity than that of their constituent metals.
(b) Alloys usually have much (lower/higher) temperature coefficients
of resistance than pure metals.
(c) The resistivity of the alloy manganin is nearly independent of increases rapidly with increase of
temperature
(d) The resistivity of a typical insulator
(e.g., amber) is greater than that of a metal by a factor of the order of ( left.mathbf{1 0}^{mathbf{2 2}} / mathbf{1 0}^{mathbf{3}}right) )
12
301 ( boldsymbol{K} boldsymbol{B r}+boldsymbol{M n O}_{2}+boldsymbol{H}_{2} boldsymbol{S O}_{4}(text {conc.}) longrightarrow )
( boldsymbol{K} boldsymbol{H} boldsymbol{S} boldsymbol{O}_{mathfrak{S}}+boldsymbol{M} boldsymbol{n} boldsymbol{S} boldsymbol{O}_{4}+boldsymbol{H}_{2} boldsymbol{O}+[boldsymbol{X}] )
(unbalanced equation). Which statement is/are correct?
This question has multiple correct options
A. ( X ) turns starch paper orange red
B. ( X ) with ( A g N O_{3} ) solution gives a pale yellow ppt. which ‘s completely soluble in excess ammonium hydroxide
c. ( X ) produces violet colour in organic layer in ( K I ) solution
D. ( X ) is liberated when a mixture of ( K B r, K_{2} C r_{2} O_{7} ) and
conc. ( H_{2} S O_{4} ) is heated
12
302 The oxidation number of Mn in the
product of alkaline oxidative fusion of
( M n O_{2} ) is:
12
303 Q. 68 (a) Answer the following questions
(0 Which element of the first transition series has highest second
ionisation enthalpy?
(11) Which element of the first transition series has highest third
ionisation enthalpy?
(iii) Which element of the first transition series has lowest enthalpy of
atomisation?
(b) Identify the metal and justify your answer.
(i) Carbonyl M(CO).
(ii) MO,F
12
304 Cigarette gas lighter is made up of:
A. Noble metal
B. Alkali metal
c. Misch metal
D. None of these
12
305 Which of the following represents the electronic configuration of d-block
elements?
A ( cdot(n-1) s^{2} n d^{1-10} )
B . ( (n-1) d^{1-10} n s^{1-2} )
C ( cdot(n-1) s^{2} p^{6} n s^{1} )
D. ( n s^{2} p^{2} d^{1} )
12
306 General electronic configuration of
inner transition element is
12
307 Does ( C u^{+} ) ion show colour? 12
308 Which of the following statements is correct regarding actinides?
A. All are synthetic elements
B. Include element 104
c. Have only short lived isotopes
D. Have variable valency
12
309 The INCORRECT statement is:
A. The spin – only magnetic moments of ( left[mathrm{Fe}left(mathrm{H}_{2} mathrm{O}right)_{6}right]^{2+} ) and ( left[C rleft(H_{2} Oright)_{6}right]^{2+} ) are nearly similar
B. The spin-only magnetic moment of ( left[N ileft(N H_{3}right)_{4}left(H_{2} Oright)_{2}right]^{2+} ) is ( 2.83 B M )
C. The gemstone, ruby, has ( C r^{3+} ) ions occupying the octahedral sites of beryl
D. The color of ( left[mathrm{CoCl}left(mathrm{NH}_{3}right)_{5}right]^{2+} ) is violet as it absorbs the yellow light
12
310 Which is the coloured ion?
( mathbf{A} cdotleft[C u(C N)_{4}right]^{3} )
B . ( left[S cleft(H_{2} Oright)_{6}right]^{3+} )
( mathbf{c} cdotleft[M nleft(H_{2} Oright)_{6}right]^{3+} )
D. All of these
12
311 What is meant by Lanthanide contraction? Write the general
electronic configuration of inner transition elements.
12
312 Match the column I with column II and
mark the appropriate choice.
” Column I
An element which
( (A) )
( 1+8 ) can show
(i) oxidation state
An element with ( 7+ )
(B) as the most stable
(ii) ( P m ) oxidation state in
its oxides
Radioactive
(iii) 0
( mathcal{D}_{mathcal{S}} )
(C) Ianthanoid
Lanthanoid which
(D) shows shows +4 oxidation state 4
(iv) ( M n )
( mathbf{A} cdot(A) rightarrow(i),(B) rightarrow(i i),(C) rightarrow(i i i),(D) rightarrow(i v) )
B ( cdot(A) rightarrow(i i),(B) rightarrow(i i i),(C) rightarrow(i v),(D) rightarrow(i) )
C ( cdot(A) rightarrow(i v),(B) rightarrow(i),(C) rightarrow(i i),(D) rightarrow(i i i) )
D. ( (A) rightarrow(i i i),(B) rightarrow(i v),(C) rightarrow(i i),(D) rightarrow(i) )
12
313 Which of the following oxide has the maximum basicity?
A. ( operatorname{Pr}_{2} ) O ( _{3} )
в. ( L a_{2} O_{3} )
( mathrm{c} cdot mathrm{Sm}_{2} mathrm{O}_{3} )
D. ( G d_{2} O_{3} )
12
314 Write the different oxidation states of
manganese.Why +2 oxidation state of
manganese is more stable?
12
315 Assertion
Melting point of ( M n ) is more than that
of ( boldsymbol{F e} )
Reason
Mn has higher number of unpaired ( e^{-} )
than ( F e ) in atomic state
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Assertion is incorrect but Reason is correct
12
316 Write the uses of Lanthanides and
Actinides.
12
317 Gallium is in
room temperature.
A. plasma
B. liquid
c. solid
D. gaseous
12
318 Lanthanoid for which +2 and +3
oxidation states are common is:
A . La
B. Eu
( c cdot c e )
D. Nd
12
319 Which of the following has the maximum number of unpaired ( d )
electrons?
A ( cdot Z n^{2} )
B. ( F e^{2+} )
( c cdot N i^{3} )
D. ( C u^{+} )
12
320 0.37 Out of Cu Cl, and CuCl2, which is more stable and why?
anal and CUCCucii
12
321 Question 16. Reactivity of transition
regularly from Sc to Cu. Explain.
elements decreases almost
12
322 Which one of the following shows highest magnetic moment?
A ( cdot F e^{2} )
в. ( C o^{2} )
( c cdot C r^{3} )
D. ( N i^{2} )
12
323 Maximum ferromagnetism is found in?
A . ( F e )
в. ( N i )
c. ( C o )
D. None
12
324 The lanthanide element that has the
electronic configuration ( [boldsymbol{X} boldsymbol{e}] boldsymbol{4} boldsymbol{f}^{7} boldsymbol{5} boldsymbol{d}^{1} boldsymbol{6} boldsymbol{s}^{2} )
is:
A. Lutetium
B. Terbium
c. Ytterbium
D. Gadolinium
12
325 The colour of ( _{62} S m^{3+} ) is yellow. The
colour of ( _{66} D y^{3+} ) is:
A. colourless
B. yellow
c. red
D. blue
12
326 Match the catalysts to the correct
processes:
Catalyst ( quad ) Process
A. ( T i C l_{3} ) ¡. Wacker process
ii. Ziegler – Natta
B. ( P d C l_{2} quad ) polymerization
С. ( C u C l_{2} )
iii. Contact process
D. ( V_{2} O_{5} )
¡v. Deacon’s process
( A cdot(A)-(i i i),(B)-(i i),(C)-(i v),(D)-(i) )
B. (A) – (ii), (B) – (i), (C) – (iv), (D) – (iii)
C. ( (A)-(text { ii) },(B)-(text { iii) },(C)-(i v),(D)-(i) )
D. (A) – (iii), (B) – (i), (C) – (ii), (D) – (iv)
12
327 A dilute ferrous sulphate solution was
gradually added to the beaker
containing acidified potassium
permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
A ( cdot K M n O_{4} ) is an oxidising agent, and it oxidies ( F e S O_{4} )
B. ( F e S O_{4} ) acts as an oxidising agent and oxidises
( K M n O_{4} )
C. The colour disappear due to dilution; no reaction is involved
D. ( K M n O_{4} ) is an unstable compound and decomposes is presence of ( F e S O_{4} ) to a colourless compound
12
328 The properties of ( Z r ) and ( H f ) are similar because:
A. both belong to d-block
B. both belong to same group of the periodic table
c. both have similar radii
D. both have same number of electrons
12
329 Select incorrect statement.
A. Ionisation energies of 5d-elements are greater than those of ( 3 d ) and ( 4 d ) elements.
B. Cu(l) is diamagnetic while Cu(II) is paramagnetic.
( mathbf{c} cdotleft[T ileft(H_{2} Oright)_{6}right]^{3+} ) is coloured while ( left[S cleft(H_{2} Oright)_{6}right]^{3+} )
colourless.
D. Transition elements cannot form complexes.
12
330 The colour of ( C u C r_{2} O_{7} ) solution in
water is green because
A ( cdot C u^{2+} ) ion is green
в. ( C r_{2} O_{7}^{2} )
c. both the ions are green
D. ( C u^{2+} ) ion is blue and ( C r_{2} O_{7}^{2-} ) ion is yellow
12
331 The stable oxidation states of Cr are:
( A cdot+3,+6 )
( B cdot+3,+4 )
( c cdot+1,+4 )
( D cdot+2,+5 )
12
332 2
ans.
26 General electronic configuration of actinoids is (n-2) f 1-14 (n-1)
d
Which of the following actinoids have one electron in 6d orbital?
(a) U (Atomic number. 92)
(b) Np (Atomic number. 93)
(c) Pu (Atomic number. 94)
(d) Am (Atomic number. 95)
12
333 Elements which generally exhibit variable oxidation states and form
colored ions are
A. metalloids
B. transition elements
c. non-metals
D. gases
12
334 Number of d-electrons in chromium of
( left[C rleft(H_{2} Oright)_{6}right]^{+3} ) ion are:
( A )
B. 2
( c cdot 3 )
D. 4
12
335 31 The electronic configuration of valence shell of Cu is 3d 10 451 and not
3d 4s?. How is this configuration explained?
12
336 With regard to the exhibiting oxidation states the correct statement would be:
A. Lanthanides form largest number of oxidation states
B. Actinides form largest number of oxidation states
c. Lanthanides and actinides have almost same tendency to exhibit various oxidation states
D. Actinides exhibit least number of oxidation states
12
337 Which of the following cannot form oxo ion?
( mathbf{A} cdot P u O_{2}^{+} )
B. ( mathrm{CeO}_{2}^{+} )
( mathbf{c} cdot U O_{2}^{2+} )
D. ( N p O_{2}^{text {th }} )
12
338 The magnetic moment of ( boldsymbol{K}_{mathbf{2}}left[boldsymbol{M} boldsymbol{n} boldsymbol{C l}_{4}right] )
corrected to the nearest integer is
( mathbf{A} cdot 6 B M )
в. ( 7 B M )
( mathbf{c} cdot 8 B M )
D. ( 5 B M )
12
339 Which of the following represents the oxide of cerium?
This question has multiple correct options
A. ( C e_{3} O_{4} )
в. ( C e O_{4} )
( mathrm{c} cdot mathrm{Ce}_{2} mathrm{O}_{3} )
D. ( operatorname{Ce} mathrm{e}_{2} )
12
340 Which of the following elements does not show +4 oxidation state?
A ( . Z r )
в. ( P t )
c. ( L a )
D. ( T i )
12
341 The magnetic moment of
( left[boldsymbol{C o}left(boldsymbol{N} boldsymbol{H}_{3}right)_{6}right] boldsymbol{C l}_{3} ) is:
A . 1.73
в. 2.83
c. 6.6
D. zero
12
342 For given reaction:
( boldsymbol{C r}_{2} boldsymbol{O}_{7}^{2-} stackrel{boldsymbol{H}^{+}}{longrightarrow} boldsymbol{C r}^{3} )
Eq.wt of ( boldsymbol{C r}_{2} boldsymbol{O}_{7}^{2-} ) is:
A. mol. wt. ( / 6 )
B. mol. wt./3
c. mol. wt. ( / 4 )
D. mol. wt./1
12
343 Consider following complexes:
I: ( left[boldsymbol{F e}left(boldsymbol{H}_{2} boldsymbol{O}right)_{6}right]^{2+} )
( |:left[boldsymbol{F} boldsymbol{e}(boldsymbol{C} boldsymbol{N})_{boldsymbol{6}}right]^{4-} )
( | I:left[N i(C O)_{4}right] )
( mid V:left[N ileft(H_{2} Oright)_{4}right]^{2+} )
( mathbf{V}:left[boldsymbol{N} boldsymbol{i}(boldsymbol{C} boldsymbol{N})_{4}right]^{2-} )
Out of this, select the complex with equal number of unpaired electrons:
( mathbf{A} cdotleft[F eleft(H_{2} Oright)_{6}right]^{2+} )
B ( cdotleft[N i(C O)_{4}right] )
c. ( left[N ileft(H_{2} Oright)_{4}right]^{2+} )
D. None of these
12
344 Among ( boldsymbol{V}(boldsymbol{Z}=mathbf{2 3}), boldsymbol{C r}(boldsymbol{Z}=mathbf{2 4}) )
( M n(Z=25) ) and ( F e(Z=26), ) which
will have the highest magnetic
moment?
A. ( V )
в. ( C r )
( c . M n )
D. ( F e )
12
345 Misch metal is:
A. an alloy of lathanide and copper
B. an alloy of lanthanide and nickel
C . an alloy of lathanide,iron and carbon
D. an alloy of calcium and copper
12
346 The ionic radius of ( _{57} L a^{3+} ) is ( 1.06 mathrm{A} ) Which one of the following given values will be closest to the ionic radius of
( mathbf{7}_{1} boldsymbol{L} boldsymbol{u}^{mathbf{3}+} ? )
A . 1.06 A
B. 1.56 A
c. ( 0.85 mathrm{A} )
D. 1.35 A
12
347 The aqueous solution containing which one of the following ions will be colourless:
A ( cdot F e^{2} )
B. ( M n^{2+} )
( c cdot T i^{3} )
( mathrm{D} cdot mathrm{Sc}^{3} )
12
348 Which of the following metal oxides is white in colour but becomes yellow on heating?
A. ( A g_{2} O )
в. ( Z n O )
c. ( F e O )
D. ( M g O )
12
349 Choose the correct answer from the
alternative given. When an oxide of manganese (P) is fused with KOH in the presence of an
oxidizing agent and dissolved in water, it gives a dark green solution of compound (Q). Compound (Q) disproportionates in neutral or acidic solution to give purple compound (R). An alkaline solution of compound (R)
oxidizes potassium iodide solution to a compound (S) and compound (P) is also formed. Compounds ( P ) to ( S ) are:
A ( cdot(P)-M n O_{4}^{-},(Q)-K I O_{3},(R)-M n O_{2},(S)- )
( K_{2} M n O_{4} )
B . ( (P)-M n O_{2},(Q)-K_{2} M n O_{4},(R)-M n O_{4}^{-},(S)- )
( K I O_{3} )
C ( cdot(P)-M n O_{2},(Q)-M n O_{4}^{-},(R)-K 2 M n O_{4},(S) )
( K I O_{3} )
D ( cdot(P)-K_{2} M n O_{4},(Q)-M n O_{2},(R)-M n O_{4}^{-},(S)- )
( K I O_{3} )
12
350 What may be the stable oxidation state of the transition element with the
following delectron configurations in the ground state of their atoms:
( 3 d^{3}, 3 d^{5}, 3 d^{8} ) and ( 3 d^{4} ? )
12
351 Total number of inner transition
elements in the periodic table is:
A . 10
B. 14
( c cdot 28 )
D. 30
12
352 The colour of ( C r O_{4}^{2-} ) is due to:
A. charge tranfer.
B. d-d transition.
c. it does not shows colour.
D. none of the above
12
353 For ( M^{2+} / M ) and ( M^{3+} / M^{2+} ) systems the ( E^{ominus} ) values for some metals are as follows:
( C r^{3} / C r^{2+} )
( boldsymbol{C r}^{2+} / boldsymbol{C r} quad_{boldsymbol{$}}^{-boldsymbol{0 . 9} boldsymbol{V}} )
( / M n quad-1.2 V ) ( M n^{3+} ) ( M n^{2+} ) ( / M n^{2+} )
( -0.4 V )
( F e^{3+} / F e^{2+} )
Use this data to comment upon:
(i) the stability of ( F e^{3+} ) in acid solution
as compared to that of ( C r^{3+} ) or ( M n^{3+} )
and
(ii) the ease with which iron can be
oxidised as compared to a similar process for either chromium or
manganese metal
12
354 Of the ions ( A g^{+}, C o^{+2} ) and ( T i^{+4} ) which
one will be coloured in aqueous
solution?
12
355 Explain why:
( C u^{+} ) is diamagnetic but ( C u^{2+} ) is paramagnetic. ( (Z=29) )
12
356 Each question below consists of two statements. I in the left-hand column
and II in the right-hand For each
question. determine whether statement is true or false and whether statement
II is true or false.
I: Potassium permanganate is a colored compound.
Il: Both potassium and manganese are
metals.
A. Both statements are true
B. Statement I is true and Statement II is false
c. Statement II is true and Statement I is false
D. Both Statements are false
12
357 Most transition metals-
I: forms sets of compounds that display
different oxidation states of the metal.
Il: form colored ions in solution
III: burn vigorously in oxygen
IV: replace ( H_{2} ) from dilute acids of these
A. I, II, III are correct
B. II, III, Iv and correct
C. I, II are correct
D. all are correct
12
358 Explain with reasons:
(i) Transition elements show variable
oxidation states
(ii) Transition elements form coloured
compounds.
(iii) The size of Lanthanide elements
decreases from La to Lu.
12
359 A complex compound of cobalt has
molecular formula containing five ( boldsymbol{N} boldsymbol{H}_{3} )
molecules, one ( N O_{2} ) group and two ( C l )
atoms for one ( C ) otom. One mole of this
compound produces three moles of ions in aqueous solution. On reacting with
an excess of ( A g N O_{3} ) solution,
two moles of ( A g C l ) get precipitated. The
ionic formula of the compound is:
( mathbf{A} cdotleft[operatorname{Co}left(N H_{3}right)_{4} N O_{2} C lright]left[left(N H_{3}right) C lright] )
B ( cdotleft[operatorname{Co}left(N H_{3}right)_{5} C lright]left[C lleft(N O_{2}right)right. )
( mathbf{c} cdotleft[operatorname{Co}left(N H_{3}right)_{5}left(N O_{2}right)right] C l_{2} )
D. ( left[operatorname{Co}left(N H_{3}right)_{5}right]left[left(N O_{2}right) C l_{3}right] )
12
360 ( ln S c^{3+}, T i^{2+}, T i^{3+}, V^{2+}, ) increasing
order of spin only magnetic moment is:
A. ( S c^{3+}<T i^{2+}<T i^{3+}<V^{2+} )
B. ( S c^{3+}<T i^{3+}<T i^{2+}<V^{2+} )
c. ( T i^{2+}<S c^{3+}<T i^{3+}<V^{2+} )
D. ( S c^{3+}<T i^{2+}<V^{2+}<T i^{3+} )
12
361 Which of the following is natural element?
A. Pm
B . La
c. Pu
D. Np
12
362 Neptunium is radioactive and emits a beta particle and gives:
A. plutonium
B. uranium
c. californium
D. curium
12
363 Which of the following statements are true for Mohr’s salt?
This question has multiple correct options
A . it decolourizes ( K M n O_{4} ) solution
B. it is a double salt
( mathrm{c} ). it is a colourless salt
D. it is primary standard substance
12
364 Which one of the following elements shows maximum number of different
oxidation states in its compounds?
A . Eu
B . La
( c cdot ) Gd
( D cdot A m )
12
365 The atomic number of the element having magnetic moment equal to ( 1.7 mathrm{BM} ) in its +2 oxidation state is:
A . 29
B. 25
( c cdot 24 )
D. 30
12
366 Oxidation number of chromium in
potassium dichromate is:
( A cdot+4 )
B. +5
( c cdot+6 )
( D cdot+3 )
12
367 Gadolinium belongs to ( 4 f ) series. It’s
atomic number is ( 64 . ) Which of the
following is the correct electronic configuration of gadolinium?
( mathbf{A} cdot[X e] 4 f^{7} 5 d^{1} 6 s^{2} )
B. ( [X e] 4 f^{6} 5 d^{2} 6 s^{2} )
( mathbf{c} cdot[X e] 4 f^{8} 6 d^{2} )
D ( cdot[X e] 4 f^{9} 5 s^{1} )
12
368 form oxocations.
A. Lanthanides
B. Actinides
c. Nobel gases
D. Alkali metalss
12
369 28 Which of the following ions show higher spin only magnetic moment
are
0.28 Which of
value?
(a) T²+
(c) Fe2+
(b) Mn2+
(d) Cos+
12
370 Which of the following is not an element of first transition series?
( A cdot F e )
B. co
c. ( mathrm{Ni} )
D. Agg
12
371 What is Misch metal? Give its
composition and uses.
12
372 In lanthanum, the differentiating
electron enters into:
( mathbf{A} cdot d ) sub shel
B. ( f ) sub shell
c. ( s ) sub shell
D. ( p ) sub shell
12
373 An f-shell containing 6 unpaired electrons can exchange:
A. 6 electrons
B. 9 electrons
c. 12 electrons
D. 15 electrons
12
374 What is the oxidation state of ( C r ) in
( left[boldsymbol{C r}left(boldsymbol{O}_{2}right)_{4}right]^{3-} ? )
( A cdot+3 )
( B cdot+4 )
( c cdot+5 )
( D cdot+6 )
12
375 Transition metals are good electrical
conductor because
A. they are metals
B. they are solids
C. they have free electrons in outer energy levels
D. they are hard
12
376 The electronic configuration of gadolinium (At. no.64) is:
A ( cdot[X e] 4 f^{8}, 5 d^{0}, 6 s^{2} )
B . ( [X e] 4 f^{7}, 5 d^{1}, 6 s^{2} )
C . ( [X e] 4 f^{3}, 5 d^{5}, 6 s^{2} )
D . ( [X e] 4 f^{6}, 5 d^{2}, 6 s^{2} )
12
377 Generally transition elements for
coloured salts due to the presence of
unpaired electrons. Which of the following compound will be coloured in solid state?
A. ( A g_{2} S O_{4} )
в. ( C u F_{2} )
c. ( C u_{2} C l_{2} )
D. ( Z n F_{2} )
12
378 The trivalent ion having largest size in Lanthanide series is:
( mathbf{A} cdot T i )
в. ( Z r )
c. ( H f )
D. La
12
379 For the dichromate dianion, which of the
following is true?
1) ( 4 C r-O ) bonds are equivalent
2) ( 6 C r-O ) bonds are equivalent
12
380 Consider following statements.
( (I) ) The size of the lanthanide ions
( left(M^{3+}right) ) decreases as the atomic
number of ( M ) increases.
( (I I) ) Electronic spectra of lanthanides show very broad bands.
( (I I I) ) As with transition metals, coordination number six is very
common in lanthanide complexes.
Which of the statements given above
is/are correct?
A. ( I ) only
B. ( I ) and ( I I )
c. ( I ) and ( I I I )
D. III only
12
381 Q. 43 Although +3 oxidation states is the characteristic oxidation state of
lanthanoids but cerium shows +4 oxidation state also. Why?
12
382 Spin only magnetic moment value of ( C r^{3+} ) ion is:
A . 2.87 вм
в. 3.87 вм
( mathrm{c} .3 .47 ) вм
D. 3.67 ВМ
12
383 Find the species/elemental atom that has a minimum number of unpaired electrons.
( A cdot K r^{+} )
B. ( M n^{2+} )
( mathrm{c} cdot mathrm{Fe}^{3} )
D. ( O^{+} )
12
384 Aluminium appears like gold when mixed with :
A. ( 90 % ) Cu
B. 75 % Ni
( c cdot 80 % ) sn
D. 80 % Co
12
385 0.33 Why Evalues for Mn, Ni and Zn are more negative than expected?
22.
bet filled and completak
12
386 Which of the following pairs has the
same size?
A. ( Z n^{2+}, H f^{4} )
B. ( F e^{2+}, N i^{4+} )
( mathbf{c} cdot Z n^{4+}, T i^{4+} )
D. ( Z r^{4+}, H i^{4+} )
12
387 give any four characteristic properties of transition elements? 12
388 Most of the radio active elements are
present in
A. Lanthanoids
B. Actinoids
c. Representative elements
D. Second transition series
12
389 Cerium ( (z=58) ) is an important member of the lanthanides. Which of
the following statements about cerium is incorrect?
A. The common oxidation states of cerium are +3 and +4
B. The +3 oxidation state of cerium is more stable than the +4 oxidation state
c. The +4 oxidation state of cerium is not known in solutions
D. Cerium (IV) acts as an oxidising agent.
12
390 Magnetic moment of ( boldsymbol{C r}(boldsymbol{Z}= ) ( mathbf{2 4}), boldsymbol{M n}^{+}(boldsymbol{Z}=mathbf{2 5}) ) and ( boldsymbol{F} boldsymbol{e}^{mathbf{2}+}(boldsymbol{Z}=mathbf{2 6}) )
are ( x, y, z . ) They are in order:
A. ( x<y<z )
в. ( x=y<z )
c. ( z<x=y )
D. ( x=y=z )
12
391 On heating potassium permanganate, one of the following compound is not obtained. Identify the compound.
( A cdot O_{2} )
в. ( M n O )
c. ( M n O_{2} )
D. ( K_{2} M n O_{4} )
12
392 Which of the following is the most basic?
( mathbf{A} cdot C e(O H)_{3} )
в. ( L u(O H)_{3} )
( mathbf{c} cdot Y b(O H)_{3} )
D. ( A l(O H)_{3} )
12
393 Is ( C r_{2} O_{3} ) an amphoteric oxide? If yes
enter ( 1, ) else enter 0
12
394 ( C r^{2+} ) is unstable in water. 12
395 The stable oxidation state of ( boldsymbol{C} boldsymbol{e}(boldsymbol{Z}= )
( mathbf{5 8} ) ) is:
( A cdot+4 )
( B cdot+3 )
( c cdot+2 )
( D cdot+5 )
12
396 Write a chemical equation for burning
of lanthanoids ( (text { ln }) ) in oxygen.
12
397 The trivalent ion having largest size is
A. Ti
B. zr
( c . ) нf
D. La
12
398 Which of the following compounds is
not colored?
A. ( N a_{2} C u C l_{4} )
в. ( N a_{2} C d C l_{4} )
( mathbf{c} cdot N a_{3}left[F e(C N)_{6}right] )
D. ( K_{3}left[F e(C N)_{6}right] )
12
399 The complex ion which has no ( ^{prime} d^{prime} )
electrons in the central metal atom is:
( mathbf{A} cdotleft[M n O_{4}right]^{-} )
B ( cdotleft[operatorname{Co}left(N H_{3}right)_{6}right]^{3+} )
c. ( left[F e(C N)_{6}right]^{3-} )
D・ ( left[C rleft(H_{2} Oright)_{6}right]_{6}^{3+} )
12
400 29. Brass gets discoloured in air due
to constant exposure in presence
of:
(1) Aluminium phosphide
(2) Hydrogen sulphide
(3) Hydrogenated wafers
(4) Aluminium sulphide
12
401 Which element exhibits highest density
in 3d series?
A . Sc
B. cr
( c cdot z n )
D. cu
12
402 Identify the correct statement(s):
This question has multiple correct options
A. The oxidation number of ( C r ) in ( C r O_{5} ) is +6
B. ( Delta H>Delta U ) for the reaction ( N_{2} O_{4}(g) rightarrow 2 N O_{2}(g) )
provided both gases behave ideally.
C ( . ) pH of ( 0.1 N H_{2} S O_{4} ) is less than that of ( 0.1 mathrm{N} mathrm{HCl} ) at
( 25^{circ} C )
D ( cdotleft(frac{R T}{F}right)=0.0591 ) volt at ( 25^{circ} mathrm{C} )
12
403 Which of the following statements concerning Lanthanide elements is false?
A. All Lanthanides are highly dense metals
B. Most characteristic oxidation state of Lanthanide elements is +3
C. The ionic radii of trivalent Lanthanides steadily increase with increase in the atomic number
D. Lanthanoids are separated from one another by ion exchange methods
12
404 Which is the first energy level containing f-orbitals? 12
405 Which of the following is not an interstitial compound?
A . ( T i C )
в. ( M o C )
( mathrm{c} cdot F e_{0.82} mathrm{O} )
( mathrm{D} cdot mathrm{Cr}_{2} mathrm{O}_{3} )
12
406 0.65 When
When a chromite ore (A) is fused with sodium carbonate in free excess
of air and the product is dissolved in water, a yellow solution of
compound (B) is obtained. After treatment of this vellow solution with
sulphuric acid, compound (C) can be crystallised from the solution.
When compound (C) is treated with KCl, orange crystals of compound (D)
crystallise out. Identify A to D and also explain the reactions.
on in an oranda como
12
407 Give any two differences between
lanthanoids and actinoids.
12
408 The maximum number of possible oxidation states of actinoides are
shown by:
A. Berkelium ( (B k) ) and califormium ( (C f) )
B. Nobelium (No) and lawrencium (Lr)
c. Actinium ( (A c) ) and throium ( (T h) )
D. Neptunium (Np) and plutonium (Pu)
12
409 Why do transition elements form alloys? 12
410 Write down the reaction involved in
preparation of Potassium dichromate from chromine ore.
12
411 2.1 Electronic configuration of a transition element X in +3 oxidation state is
[Ar]3d. What is its atomic number?
(a) 25
(b) 26
(c) 27
(d) 240
12
412 Assertion
The catalytic converter in the car’s exhaust system converts polluting exhaust gases into non-toxic gases.
Reason
Catalytic converter contains a mixture of transition metals and their oxides
embedded in the inner support.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
413 Choose the incorrect statement.
A. Size of ( 4 d ) and ( 5 d ) series elements is almost same
B. Generally, negative value of standard reduction potential ( left(M^{2+} / Mright) ) of ( 3 mathrm{d} ) -series element decreases across the period
( mathrm{C} cdot mathrm{Cr}_{2} mathrm{O}_{7}^{2-} ) has one type of ( mathrm{Cr}-mathrm{O} ) bond length
D. Generally, actinide and lanthanide shows +3 oxidation
state
12
414 Which of them is a mineral of
lanthanum?
A. Monazite
B. Xenotime
c. Euxenite
D. All of the above
12
415 Because of lanthanoid contraction
A. zrand Y have about the same radius
B. zrand Nb have similar oxidation state
c. zrand ( H f ) have about the same radius
D. zrand zn have the same oxidation state
12
416 Increasing order of magnetic moment among the following species is:
( N a^{+}, F e^{+3}, C o^{+2}, C r^{+2} )
A. ( N a^{+}<C o^{2+}<C r^{2+}<F e^{3+} )
B. ( N a^{+}<F e^{3+}<C r^{2+}<C o^{2+} )
c. ( C r^{2+}<C o^{2+}<N a^{+}<F e^{3+} )
D. ( C o^{2+}<N a^{+}<C r^{2+}<F e^{3+} )
12
417 State whether the given statement is true or false:
Dipositive zinc exhibits paramagnetism due to loss of two electrons from ( 3 d ) -orbitals of neutral
atom
12
418 Magnetic moment of ( S c^{2+}= ) Magnetic
moment of ( boldsymbol{C} boldsymbol{u}^{2+} )
If true enter 1 , else enter 0
12
419 Large quantity of ( K M n O_{4}, ) on
treatment with cold conc. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) forms
a compound ( (X) ) which decomposed
explosively, on heating forming ( (Y) ). The
( (X) ) and ( (Y) ) are
respectively.
( mathbf{A} cdot M n_{2} O_{7}, M n O_{2} )
в. ( M n_{2} O_{7}, M n_{2} O_{3} )
c. ( M n S O_{4}, M n_{2} O_{3} )
D. ( M n_{2} O_{3}, M n O_{2} )
12
420 Which of the following ions has a magnetic moment of 5.93 BM?
( [A t . N o .: V=23, C r=24, M n=25, F e=26] )
( mathbf{A} cdot M n^{2}+ )
B. ( F e^{2} )
( c cdot C r^{2} )
( D cdot V^{3} )
12
421 ( n s^{1} ) electronic configuration is not
present in:
( A cdot A g )
в. мп
( c cdot c r )
D. cu
12
422 10 There are 14 elements in actinoid series. Which of the following
elements does not belong to this series?
(a) U
(b) Np
(c) Tm
(d) Fm
12
423 Knowing that the chemistry of lanthanoids ( (L n) ) is dominated by its
+3 oxidation state, which of the
following statements is incorrect?
A. ( L n(I I I) ) hydroxides are mainly basic in character
B. The ionic sizes of ( operatorname{Ln}(I I I) ) decrease in general with increasing atomic number
c. Because of the large size of the ( L n(I I I) ) ions the bonding in its compounds is predominantly ionic in character
D. ( L n(I I I) ) compounds are generally colourless
12
424 A gas undergoes a thermodynamical process but the volume of the gas does not change. What is the nature of this
process?
A. Isothermal
B. Adiabatic
c. Isobaric
D. Isochoric
12
425 The magnetic moment of an ion in its +3
oxidation state is 3.85 BM. The number of
unpaired electrons present in the ion is
A
B. 4
( c cdot 3 )
D. 5
12
426 Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?
A ( cdot(n-1) d^{8} n s^{2} )
B . ( (n-1) d^{5} n s^{1} )
c. ( (n-1) d^{3} n s^{2} )
D. ( (n-1) d^{5} n s^{2} )
12
427 Select the correct options:
A. Due to lanthanide contraction ( Z r ) and ( H f ) have almost equal size.
B. ( d ) – and ( f ) -orbitals do not shield the nuclear charge very effectively
c. Both
(A) ( &(mathrm{B}) ) are correct statements.
D. Both
(A) &
(B) are incorrect statements.
12
428 Which of the following statements are
incorrect?
A. ( N b ) is stable in +4 oxidation state
B. ( B k ) in +4 oxidation state is strongly oxidising but more stable than ( C m ) and ( A m ) in +4 oxidation state
C. Uranium can form oxygenated ion such as ( U O_{2}^{2+} )
D. ( P u ) shows oxidation state up to +7
12
429 Question 12. What are the interstitial compounds? Why are such
compounds well known for transition metals
12
430 Arrange the following in increasing value of magnetic moments.
(i) ( left[boldsymbol{F e}(boldsymbol{C N})_{mathbf{6}}right]^{4-} )
(ii) ( left.boldsymbol{F e}(boldsymbol{C N})_{6}right]^{3-} )
(iii) ( boldsymbol{C r}left(boldsymbol{N} boldsymbol{H}_{3}right)_{6}^{3+} )
( left.(text { iv }) N ileft(H_{2} Oright)^{4}right]^{2+} )
A ( cdot(I)<(I I)<(I I I)<(I V) )
в. ( (I)<(I I)<(I V)<(I I I) )
c. ( (I I)<(I I I)<(I)<(I V) )
D. ( (I V)<(I I I)<(I I)<(I) )
12
431 Give reason:
(a) Cerium(Ce) exhibits +4 oxidation
state.
(b) Actinoid contraction is greater from element to element than lanthanoid
contraction.
12
432 The lanthanide contraction is
responsible for the fact that
A. zn and Y have about the same radii
B. zrand Nb have similar oxidation state
c. zrand Hf have about the same radii
D. zrand zn have the same oxidation state
12
433 The point of dissimilarity between lanthanides and actinides is:
A. three outermost shells are partially filled
B. they show oxidation of ( +3( ) common)
c. they are called inner transition elements
D. they are radioactive in nature
12
434 0.56 Match the solutions given in Column I and the colours given in
Column II.
Column 1
Column II
(Aqueous solution of salt)
(Colour)
FeSO7H,
Green
NICI, 4H, O
Light pink
MnCl, 41,0
Blue
COCI, 6H,
4. Pale green
CuCl₂
Pink
Colourless
12
435 Q. 40 Although Cr3+ and Co2+ ions have same number of
but the magnetic moment of Cr3+ is 3.87 BM and that of Cost is
4.87 BM, Why?
Ans Magnetic moment of a
the bonic of snin as well as orbital
12
436 A member of Lanthanide is:
This question has multiple correct options
A. Cesium
B. Lanthanum
C. Neoybium
D. Luticium
12
437 Which of the following reactions are disproportionation reactions?
(।) ( C u^{+} rightarrow C u^{2+}+C u )
(II) ( 3 M n O_{4}^{-}+4 H^{+} rightarrow 2 M n O_{4}^{-}+ )
( M n O_{2}+2 H_{2} O )
(III) ( 2 K M n O_{4} rightarrow K_{2} M n O_{4}+ )
( M n O_{2}+O_{2} )
( (mathrm{IV}) 2 M n O_{4}^{-}+3 M n^{2+}+2 H_{2} O rightarrow )
( mathbf{5} M n O_{2}+4 H^{+} )
( A cdot(1),(1) )
B. (I), (II), (III)
( c cdot(11),(11),(1 v) )
( D .(1),(1 v) )
12
438 ( M n O_{2}+K O H+O_{2} stackrel{Delta}{rightarrow} )
( mathbf{2 K}_{mathbf{2}} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4}+mathbf{4} boldsymbol{H}_{2} boldsymbol{O} )
pot manganate
If true enter 1 else 0
( mathbf{A} cdot mathbf{1} )
12
439 Which of the following compounds will
not give ( +v e ) chromyl chloride test?
A. ( C u C l_{2} )
в. ( H g C l_{2} )
c. ( Z n C l_{2} )
D. ( C_{6} H_{5} N H_{2} H C l )
12
440 Lanthanoid contraction is caused due
to:
A. imperfect shielding of outer electrons by ( 4 f ) – electrons from the nuclear charge.
B. appreciable shielding on outer electrons by ( 4 f ) electrons from the nuclear charge.
C . appreciable shielding on outer electrons by ( 5 d ) electrons from nuclear charge.
D. the same effective nuclear charge from Ce to Lu.
12
441 Choose the correct answer from the
alternative given
Amongst ( T i F_{6}^{2-}, C o F, C u_{2} C l_{2} ) and
NiCl, which are the colourless
species? (atomic number of ( mathrm{Ti}=22, mathrm{Co}= ) ( 27, C u=29, N i=28) )
A ( cdot C o F_{6}^{3-} ) and ( N i C l_{4}^{2} )
B . ( T i F_{6}^{2-} ) and ( C u_{2} C l_{2} )
c. ( C u_{2} C l_{2} ) and ( N i C l_{4}^{2} )
D. ( T i F_{6}^{2-} ) and ( C o F_{6}^{3-} )
12
442 Order of magnitude of density of
Uranium nucleous is: ( left[boldsymbol{m}_{boldsymbol{p}}=mathbf{1 . 6 7} timesright. )
( left.mathbf{1 0}^{-mathbf{2 7}} mathbf{k g}right] )
A ( cdot 10^{20} mathrm{kgm}^{3} )
В . ( 10^{17} mathrm{kgm}^{3} )
( mathbf{c} cdot 10^{14} mathrm{kgm}^{3} )
D. ( 10^{11} mathrm{kgm}^{3} )
12
443 Which of the following Lanthanoid is radioactive?
A. Cerium
B. Promethium
c. Thulium
D. Lutetium
12
444 Explain why:
Transition elements form coloured
compounds.
12
445 The d-electron configurations of ( boldsymbol{C r}^{2+}, boldsymbol{M n}^{2+}, boldsymbol{F} boldsymbol{e}^{2+} ) and ( boldsymbol{C o}^{2+} ) are
( d^{4}, d^{5}, d^{6} ) and ( d^{7} ) respectively. Which one
of the following will exhibit minimum paramagnetic behaviour? (Atomic numbers of ( mathrm{Cr}=mathbf{2 4}, boldsymbol{M n}= )
( mathbf{2 5}, mathbf{F e}=mathbf{2 6}, mathbf{C o}=mathbf{2 7}) )
( mathbf{A} cdotleft[M nleft(H_{2} Oright)_{6}right]^{2+} )
в. ( left[mathrm{Fe}left(mathrm{H}_{2} mathrm{O}right)_{6}right]^{2} )
c. ( left[operatorname{Co}left(H_{2} Oright)_{6}right]^{2+} )
D ( cdotleft[C rleft(H_{2} Oright)_{6}right]^{2} )
12
446 Q. 62 Assertion (A) Cu cannot liberate hydrogen from acids.
Reason (R) Because it has positive electrode potential.
12
447 25 Which of the following actinoids show oxidation states upto +7?
(a) Am . (b) Pu
(c) U
(d) Np
12
448 Transition metals show paramagnetism
due to
A. Characteristic configuration
B. high lattice energy
c. variable oxidation states
D. unpaired electrons
12
449 Which one of the transition metal ions
have no unpaired electrons?
( mathbf{A} cdot mathbf{T}_{mathbf{i}^{+}} )
B. ( v^{+4} )
( c cdot v^{+3} )
( D cdot c r^{3} )
12
450 I.P values of post lanthanides ( (boldsymbol{A} boldsymbol{g}, boldsymbol{A} boldsymbol{u}) )
have higher values down the group. Explain.
12
451 Limestone is present in the blast furnace in production of iron in order to
( (I) ) provide a source of ( C a O )
( (I I) ) remove some impurities
( (boldsymbol{I I I}) ) supply ( boldsymbol{C O}_{2} )
A. ( I, I I, I I I )
в. ( I, I I )
c. ( I I, I I I )
D. I only
12
452 What is the action of acidified
potassium dichromate on the following:
1. ( boldsymbol{H}_{2} boldsymbol{S} )
12
453 Copper (II) sulfate solution is:
A . red
B. purple
c. orange
D. green
E. blue
12
454 Which of the following pair has the
same size?
( mathbf{A} cdot mathrm{Fe}^{2+}, mathrm{Ni}^{2+} )
B. ( z r^{4+}, ) Ti ( ^{4+} )
( mathbf{c} cdot z r^{4+}, H f^{4+} )
( mathbf{D} cdot mathbf{z} mathbf{n}^{2+}, mathbf{H} mathbf{f}^{4} )
12
455 Which of the following is a Lanthanoid?
A. Ta
B. Rh
( c . ) Th
D. Lu
12
456 Question 29. The chemistry of the actinoid elements is not so smooth as
that of the lanthanoids. Justify this statement by giving some examples
from the oxidation state of these elements.
12
457 ( N i^{2+} ) ion ( (Z=28) ) contains
unpaired electrons
( A )
B. 2
( c cdot 3 )
D. 5
12
458 The oxidation state of Fe in browns ring
complex ( left[mathrm{Fe}left(mathrm{H}_{2} mathrm{O}right)_{5} mathrm{NO}^{+}right] mathrm{SO}_{4} ) is:
( A cdot+1 )
( B cdot+2 )
( c cdot+3 )
( D cdot+4 )
12
459 Assertion
Equivalent mass of ( K M n O_{4} ) is equal to
one-third of its molecular mass when it
acts as an oxidising agent in an alkaline medium.
Reason
Oxidation number of ( M n ) is +7 in
( boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4} )
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
460 ( boldsymbol{C r}_{2} boldsymbol{O}_{mathbf{7}}^{2-} stackrel{boldsymbol{p H}=boldsymbol{x}}{boldsymbol{longrightarrow} boldsymbol{r} boldsymbol{O}_{4}^{2-} stackrel{boldsymbol{p H}=boldsymbol{y}}{boldsymbol{U}} boldsymbol{C}_{mathbf{2}} boldsymbol{O}_{boldsymbol{7}}^{2-}} )
pH values ( x ) and ( y ) can be:
A. 4 and 5
B. 4 and 8
( c cdot 8 ) and 4
D. 8 and 9
12
461 Which of these can absorb visible light
( ? )
A ( cdotleft[operatorname{Sc}left(H_{2} Oright)_{6}right] C l_{3} )
В ( cdotleft[T i(e n)_{3}right]left(S o_{4}right)_{2} )
( mathbf{c} cdotleft[Z nleft(N H_{3}right)_{6}right] S O_{4} )
D ( cdotleft[operatorname{Cr}left(N H_{3}right)_{6}right] C l_{3} )
12
462 Which of the following lanthanide ion is paramagnetic?
A ( cdot C e^{4} )
в. ( Y b^{2} )
( c cdot L u^{3} )
D. ( E u^{2} )
12
463 Which of the following complex ions, which is diamagnetic in nature?
A ( cdotleft[C c F_{6}right]^{3-} )
B. ( left[N i C l_{4}right]^{2-} )
c. ( left[N i(C N)_{4}right]^{2} )
( mathbf{D} cdotleft[C u C l_{2}right]^{2} )
12
464 Assertion
The degree of complex formation in
actinides decreases in the order
( boldsymbol{M}^{mathbf{4}+}>boldsymbol{M} boldsymbol{O}_{mathbf{2}}^{mathbf{2}+}>boldsymbol{M}^{mathbf{3}+}>boldsymbol{M} boldsymbol{O}_{mathbf{2}}^{+} )
Reason
Actinides form complexes with ( pi ) bonding ligands such as alkyl phosphines and thioethers.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
465 Europium is
A. s-block element
B. p-block element
c. d-block element
D. f-block element
12
466 How many unpaired electrons are there
in the electronic structure for ( C u^{+} ) ion?
( mathbf{A} cdot mathbf{1} )
B. 3
( c .5 )
D. none of these
12
467 Which of the following species have
same magnetic moment?
This question has multiple correct options
A ( cdot C r^{+} )
B. ( F e^{+3} )
c. ( C o^{+2} )
D. ( N i^{+2} )
12
468 Why ( S c^{3+} ) salts are colorless whereas
( C r^{3+} ) salt are coloured?
12
469 How will you pure potassium
permanganate crystals from its ore, pyrolusite? Give the reaction involve
12
470 The first ionisation potential of ( boldsymbol{N}, boldsymbol{P}, boldsymbol{O} ) and ( S ) are in the order of
( mathbf{A} cdot S>PN )
В . ( N>O>P>S )
c. ( N>O

S )
D. ( N<O<P<S )

12
471 The first IE of lithium is ( 5.4 mathrm{eV} ) and first
electron affinity of ( C l ) is ( 3.6 mathrm{eV} ). The value
( Delta boldsymbol{H} ) for the reaction ( boldsymbol{L} boldsymbol{i}_{(boldsymbol{g})}+boldsymbol{C l}(boldsymbol{g}) rightarrow )
( boldsymbol{L} boldsymbol{i}_{boldsymbol{g})}^{+}+boldsymbol{C l}_{(boldsymbol{g})}^{-}, ) is ( (text {in } mathrm{eV}) )
A . +1.8
в. +2.8
c. -2.8
( D ldots+9 )
12
472 An element M has the electron
configuration ( [A r] 3 d^{5} 4 s^{2} . ) So, which of the following oxide cannot exist for element
M?
A. ( M O_{2} )
B. ( M_{2} O_{3} )
c. ( M O_{4} )
D. ( M_{2} O_{7} )
12
473 The incorrect statement for d-block
element is:
A. it shows magnetic property
B. it has variable valency
c. it has tendency to form coloured ions
D. it has complete d-orbitals
12
474 Which of the following properties are common to the elements manganese,
iron, cobalt, nickel and copper?
(I) Coloured ions in aqueous solution
(II) Oxides of nitrogen on reaction with
concentrated ( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3} )
(III) Chlorides of formula ( M C l_{2} ) and
( M C l_{3} )
A. ।, ॥।, ॥।
B . ।, ॥
c. ॥, ॥ा
D. I only
12
475 4
040
Q. 6 The magnetic nature of elements depends on the presence of unpaired
electrons. Identify the configuration of transition element, which shows
highest magnetic moment.
(2) 3d
(6) 305
(d) 3d2
(c) 3d8
12
476 Write the consequences of lanthanide
contraction?
12
477 Which of the following electronic
configuration shows transition metal?
A ( cdot 1 s^{2} 2 s^{2} 2 p^{6} dots . . n s^{2} n p^{2} )
B ( cdot 1 s^{2} 2 s^{2} 2 p^{6} ldots . . n s^{2} n p^{2} n d^{3}(n+1) s^{2} )
C ( cdot 1 s^{2} 2 s^{2} 2 p^{6} ldots . . n s^{2} n p^{6} )
D. ( 1 s^{2} 2 s^{2} 2 p^{6} ldots . . n s^{2} n p^{1} )
12
478 What is meant by ferrimagnetism? Give any two examples. 12
479 Which of the following is ferromagnetic.
A. Cu, Ag, Au
B. Fe, Co, Ni
c. ( z n, ) Сd, ( mathrm{Hg} )
D. ( mathrm{Ca}, mathrm{Sr}, mathrm{Ba} )
12
480 Which of the following statements is
not correct?
This question has multiple correct options
( mathbf{A} cdot L u(O H)_{3} ) is less basic than ( L a(O H)_{3} )
B. In lanthanide series, ionic radius of ( L a^{3+}-L n^{3+} ) ion
increases
C. La is actually an element of transition series rather lanthanide
D. Atomic radius of Zr and Hf are same because of lanthanide contraction
12
481 Which of the following reagents are used as primary standard?
( boldsymbol{I}: boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4} ; boldsymbol{I} boldsymbol{I}: boldsymbol{N} boldsymbol{a} boldsymbol{O} boldsymbol{H} ; boldsymbol{I} boldsymbol{I} boldsymbol{I} )
( boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7} )
( boldsymbol{I} boldsymbol{V}: boldsymbol{F} boldsymbol{e} boldsymbol{S} boldsymbol{O}_{4}left(boldsymbol{N} boldsymbol{H}_{4}right)_{2} boldsymbol{S} boldsymbol{O}_{4} cdot boldsymbol{6} boldsymbol{H}_{2} boldsymbol{O} ; boldsymbol{V} )
( boldsymbol{H}_{2} boldsymbol{C}_{2} boldsymbol{O}_{4} cdot boldsymbol{2} boldsymbol{H}_{2} boldsymbol{O} )
A. All except II, ( I V )
B. All except I, II
C. All except ( I ), II, III
D. only ( I V )
12
482 The magnetic moment of an ion is close to ( 36 times 10^{-24} ) Joule /Tesla. The number of
unpaired electrons of the ion are
( A cdot 4 )
B. 2
( c cdot 1 )
D. 3
12
483 Which of the following shows highest magnetic moment?
A ( cdot C o^{+3} )
B. ( C r^{+} )
( mathbf{c} cdot F e^{+3} )
D. ( N i^{+2} )
12
484 ( T i^{3+} ) is more easily reduced than ( C o^{3+} )
If true enter 1 , else enter 0 .
12
485 The stability of ferric ion is due to
A. half filled f-orbitals
B. half filled d-orbitals
C. completely filled f-orbitals
D. completely filled d-orbitals
12
486 The outer electronic configuration of two members of lanthanoids series are
as follows ( 4 f^{1} 5 d^{1} 6 s^{2} ) and ( 4 f^{7} 5 d^{0} 6 s^{2} )
what are their atomic numbers? Predict
heir oxidation states.
12
487 Which of the following compounds has
a melting point of ( 606^{circ} mathrm{C} ) ?
A. cupric iodide
B. cuprous iodide
c. ferric iodide
D. ferrous iodide
12
488 The lanthanide contraction is
responsible for the fact that:
A. zrand Hf have same radius
B. Zrand Zn have the same oxidation state
c. zrand Y have same radius
D. zrand Nb have similar oxidation state
12
489 Which of the following ions have zero value of magnetic moment?
A ( cdot S c^{3} )
в. ( T i^{4} )
( c cdot Z n^{2} )
D. None of these
12
490 Choose the correct answer from the
alternative given.

Complete the following reactions.
( (i) M n O_{4}^{-}+2 H_{2} O+3 e^{-} rightarrow )
( +40 H^{-} )
( (i i) M n O_{4}^{-}+8 H^{+}+5 e^{-} rightarrow )
( +4 H_{2} O )
( (i i i) M n O_{4}^{-}+e^{-} rightarrow )
( mathbf{A} cdot M n O_{2}, M n^{2+}, M n O_{4}^{2} )
B. ( M n^{2+}, M n O_{2}, M n O_{4}^{2} )
c. ( M n O_{4}^{2-}, M n^{2+}, M n O_{4}^{2} )
D. ( M n O_{2}, M n O_{4}^{2-}, M n^{2+} )

12
491 The colour of ( M n O_{4}^{-} ) ion is due to:
A. unpaired d-electrons
B. ( d ) -d transition
c. d-p transition
D. charge transfer
12
492 Select correct statement(s).
A. Across a transition series, there is only a small decrease in atomic radius from one element to another due to very small increase in effective nuclear charge.
B. The rate of decrease in the size across the lanthanide
series is less than the across the first transition series.
c. Both
(a) &
(b) are correct statements
D. None of the above statement is correct.
12
493 Which of the following statements
is/are correct, when a mixture of ( N a C l )
and ( K_{2} C r_{2} O_{7} ) is gently warmed with
concentrated ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ? )
This question has multiple correct options
A. Deep red vapors are evolved
B. The vapors when passed into ( N a O H ) solution give a yellow solution of ( N a_{2} C r O_{4} )
c. chlorine gas is evolved.
D. Chromyl chloride is formed.
12
494 When ( I^{-} ) is oxidized by ( M n O_{4}^{-} ) in
alkaline medium, ( I^{-} ) is converted into
( A cdot I O_{3}^{-} )
в. ( I_{2} )
( mathbf{c} cdot I O_{4}^{-3} )
D. IO
12
495 When ( H_{2} O_{2} ) is added to an acidified
solution of ( K_{2} C r_{2} O_{7}, ) the solution:
A. turns green due to the formation of ( C r_{2} O_{3} )
B. turns yellow due to the formation of ( K_{2} C r O_{4} )
c. turns deep blue-violet due to the formation of ( operatorname{Cr} Oleft(O_{2}right)_{2} )
D. gives green precipitate due to the formation of ( C r(O H)_{3} )
12
496 What is/are true statement?
This question has multiple correct options
A. lons of ( d ) -block elements are colored due to ( d-d )
transition
B. Ions of ( f ) -block elements are colored due to ( f-f )
transtition
( ^{mathbf{C}} cdotleft[operatorname{Sc}left(H_{2} Oright)_{6}right]^{3+},left[T ileft(H_{2} Oright)_{6}right]^{4+} ) are colored complexes.
D. ( C u^{+} ) is colorless ion.
12
497 Te 3
Q. 24 In the form of dichromate, Cr(VI) is a strong oxidis
medium but MO(VI) in Moo, and W(VI) in WO, are not because
(a) Cr (VI) is more stable than Mo(VI) and W(VI).
(b) Mo (VI) and W (VI) are more stable than Cr(VI).
(C) Higher oxidation states of heavier members of group-6 of transition series are
more stable.
(d) Lower oxidation states of heavier members of group-6 of transition series are
more stable.
12
498 What would happen when a solution of
potassium chromate is treated with an excess of dilute nitric acid?
A ( cdot C r^{3+} ) and ( C r_{2} O_{7}^{2-} ) are formed
B. ( C r_{2} O_{7}^{2-} ) and ( H_{2} O ) are formed
C. ( C r_{2} O_{4}^{2-} ) is reduced to +3 state of ( c r )
D. ( C r_{2} O_{4}^{2-} ) oxidised to +7 state of ( c r )
12
499 Give any two difference between
lanthanoids and actinoids.
12
500 Give reasons: Silver articles becomes
black after exposure to air.
12
501 Which of the following belongs to the actinide series of elements?
A .
B. Ta
c.
D. Lu
12
502 Among the following, the couple with most positive reduction potential is :
A. ( M n^{+3} / M n^{+2} )
B. ( C r^{+3} / C r^{+2} )
c. ( F e^{+3} / F e^{+2} )
D. ( C o^{+3} / C o^{+2} )
12
503 What is the correct order of covalent
size of the following?
Ca
A. ( C a=S c )
в. ( C aS c )
D. Noneofthese
12
504 ( mu=sqrt{15} ) is true for the pair:
A ( cdot C o^{2+}, C r^{3+} )
B. ( F e^{+2}, C r^{+3} )
( mathbf{c} cdot F e^{+3}, F e^{+2} )
D. ( M n^{+2}, F e^{+2} )
12
505 Write name and symbol of one transuranic element. 12
506 Q. 4 Generally, transition elements form coloured salts a
unpaired electrons. Which of the following compounds
solid state?
(a) Ag2SO4 (b) CuF, (c) ZnF2
(d) CuCl2
ements form coloured salts due to the presence of
hich of the following compounds will be coloured in
12
507 Select correct statement for the lesser
number of oxidations states in ( 3 d- )
series.
A. In the beginning of the series it can be due to the presence of too few electrons to loose or share.
B. Towards the end of the series, it can be ascribed to the presence of too many electrons and thus fewer empty orbitals to share electrons with the ligands.
( mathrm{c} . ) Both ( (mathrm{A}) ) and ( (mathrm{B}) ) are correct
D. None of the above is correct
12
508 The ratio of magnetic moments of Fe(III) and Co(III) is:
A. ( sqrt{5}: sqrt{7} )
B. ( sqrt{35}: sqrt{24} )
c. 7: 3
D. ( sqrt{24}: sqrt{15} )
12
509 If ( M ) is the element of the actinoid
series, the degree of complex formation
decrease in the order:
A ( cdot M^{4+}>M^{3+}>M O_{2}^{2+}>M O_{2}^{+} )
B . ( M O_{2}^{+}>M O_{2}^{2+}>M^{3+}>M^{4} )
c. ( M^{4+}>M O_{2}^{2+}>M^{3+}>M O_{2}^{text {th }} )
D. ( M O_{2}^{2+}<M O_{2}^{+}M^{3+} )
12
510 Which of the following are all radio active elements?
A. Transition elements
B. P block elements
c. Lathanides
D. Actinides
12
511 Q.47 Match species given in Column I with the electronic configuration given
in Column II.
Column
Column II
A. Cr 1. [Ar]3d® 45°
B. Fe2+
2. [Ar]3d’° 45′
C. Ni²+ 3. [Ar]3d 45°
D. Cu 4. [Ar]3d45
5. [Ar]3d 452
12
512 Oxidation number of cobalt in
( Kleft[C o(C O)_{4}right] ) is:
( A cdot+1 )
( B cdot+3 )
( c cdot-1 )
( D cdot-3 )
12
513 Q. 34 Why first ionisation enthalpy of Cr is lower than that of Zn?
5
12
514 Match List I and List II.
List I
A. Americium
1. Lanthanide
B. Lanthanum
2. Transition metal
C. Promethium
3. Actinide
D. Technician
4. Synthetic element
5. Radioactive element
B. ( A-3,5 ; B-4 ; C-5 ; D-2 )
c. ( A-5 ; B-1,3 ; C-2,3 ; D-4 )
D. A – 2,5; B – 2; C – 1,5; D – –
12
515 Write the name of two metals which are
used in maximum composition in mischmetal?
12
516 If each one of the above ionic species is
in turn kept in a magnetic field, which one will get attracted?
A ( cdot C_{0}^{+2} )
B. ( M n^{+7} )
( c cdot S c^{+3} )
D. ( T i^{+} )
12
517 Question 24. A violet compound of manganese (A) decomposes on
heating to liberate oxygen and compounds (B) and (C) of manganese are
formed. Compound (C) reacts with KOH in the presence of potassium
nitrate to give compound (B). On heating compound (C) with cone. H,SO,
and NaCl, chlorine gas is liberated and a compound (D) of manganese
along with other products is formed. Identify compounds A to D and also
explain the reactions involved.
12
518 The property seen in ( f ) -block elements is :
A. Lanthanoid contraction
B. Actinide contraction
( c cdot operatorname{both}(A) ) and ( (B) )
D. Lanthanoid expansion
12
519 Electron transfer from ( F eleft(H_{2} Oright)_{6}^{2+} ) to ( F eleft(H_{2} Oright)_{6}^{3+} ) is likely to occur via:
A. ( d-d ) transition
B. inner sphere electron transfer
c. ( S_{N} 1 ) mechanism
D. outer sphere electron transfer
12
520 12 Which of the following is amphoteric oxide?
MnO,, CrO3, Cr,O3, Cro, V,05, V,04
(a) V,05,Cr, Oz
(b) Mn 07, CrO;
(c) Cro, V,05
(d) V2O5, V,04
12
521 Assertion
( C e^{4+} ) is good analytical reagent.
Reason
( C e^{4+} ) has the tendency to change to
( C e^{3+} )
A. Both Assertion and Reason are correct and Reason is
the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
522 One among the lanthanoids, ( boldsymbol{C} boldsymbol{e}(boldsymbol{I} boldsymbol{I} boldsymbol{I}) )
can be easily oxidised to ( C e(I V) ) Explain
12
523 Which is called chromic acid?
A. ( C r O )
в. ( C r_{2} O_{3} )
( mathrm{c} cdot mathrm{CrO}_{3} )
D. ( C r O_{2} )
12
524 Among the following outermost configuration of metals, which shows the highest oxidation state:
A ( cdot 3 d^{3} 3 s^{2} )
B . ( 3 d^{5} 4 s^{1} )
( mathbf{c} cdot 3 d^{5} mathbf{f} s^{2} )
D. ( 3 d^{6} 4 s^{2} )
12
525 11 KMno, acts as an oxidising agent in acidic medium. The number of moles
of KMnO4 that will be needed to react with one mole of sulphide ions in
acidic solution is
(a)
(b)
d)
UTIN
Uw
UT
IN
12
526 The magnetic moment order is correctly
given in:
( mathbf{A} cdot F e^{2+}<F e^{3+}<M n^{4+}<C r^{3+} )
B ( cdot C r^{3+}=M n^{4+}<F e^{2+}<F e^{3+} )
( mathbf{c} cdot C r^{3+}=M n^{4+}<F e^{3+}<F e^{2+} )
D ( cdot F e^{2+}<C r^{3+}<F e^{3+}<M n^{4+} )
12
527 Identify the pairs of ions possessing eq ual spin only magnetic moments:
A. ( C o^{-2}, N i^{+2} )
B. ( C o^{+2}, C r^{+3} )
c. ( F e^{+2}, F e^{+3} )
D. ( F e^{+2}, C r^{+3} )
12
528 ( C l_{2} ) gas is obtained by various reaction
select the reactions from the
following(s):
This question has multiple correct options
A. ( K M n O_{4}+ ) conc.HCl ( triangleq )
B . ( K C l+K_{2} C r_{2} O_{7}+ ) conc.H ( _{2} S O_{4} stackrel{Delta}{longrightarrow} )
c. ( M n O_{2}+ ) conc.HCl ( Delta )
D. ( K C l+F e_{2}left(S O_{4}right)_{3} rightarrow )
12
529 Which of the following is not physically
change? Magnetizing of a piece of iron.
12
530 Question 9. In what way is the electronic configuration of the
transition elements different from that of non-transition elements?
Solution Transition olomonta
12
531 ( M n O_{4}^{2-} ) changes to ( M n O_{2} ) into ( M n O_{4}^{-} ) in acidic medium. Calculate equivalent
weight of ( M n O_{4}^{2-} )
( mathbf{A} cdot 1 M )
B. ( frac{1}{2} M )
( c cdot frac{3}{2} M )
D. ( 3 M )
12
532 The transition metals (with the
exception of ( mathrm{Zn}, mathrm{Cd} ) and ( mathrm{Hg} ) ) are hard and have high melting and boiling
points. If true enter 1 else 0
12
533 Match the following catalyst with their
products
( -B ;(i i)-A ;(i i i)-D ;(i v)-C )
( mathbf{A} cdot(i) )
B ( cdot(i)-C ;(i i)-D ;(i i i)-B ;(i v)-A )
( mathbf{c} cdot(i)-D ;(i i)-A ;(i i i)-B ;(i v)-C )
D. ( (i)-A ;(i i)-B ;(i i i)-C ;(i v)-D )
12
534 In the ground state of ( C u^{+}, ) the number
of shells occupied, sub-shells occupied, filled orbitals and unpaired electrons respectively are:
[Atomic no. of copper ( =29 )
A .4,8,15,0
В. 3,6,15,1
c. 3,6,14,0
D. 4,7,14,2
12
535 Question 7. Which is the stronger reducing agent Cr2+ or Fe2+ and why?
Consider Eº values and reducing agent is stronger if it gets oxidised
easily.
12
536 When ( K M n O_{4} ) acts as an oxidising agent and ultimately forms ( left[M n O_{4}right]^{2-} ) ( M n O_{2}, M n_{2} O_{3}, M n^{2+}, ) then the
number of electrons transferred in each
case respectively is:
A .4,3,1,5
B. 1, 5, 3, 7
( c cdot 1,3,4,5 )
D. 3, 5, 7,
12
537 ( C r^{2+} ) is reducing in nature while the
same ( d- ) orbital configuration
( left(d^{4}right) M n^{+3} ) is an oxidising agent
12
538 The value of magnetic moment of ( boldsymbol{V}^{3+}(boldsymbol{Z}=mathbf{2 3}) ) is:
A ( sqrt{2} B M )
T
в. ( sqrt{3} B M )
( mathbf{c} cdot 2 B M )
D. ( sqrt{8} B M )
12
539 Catalytic activity of transition metals depends on:
A. their ability to exist in different oxidation states
B. the size of the metal atoms
c. the number of empty atomic orbitals available
D. none of these
12
540 How does gold react with aquaregia? 12
541 0.32 Why does copper not replace hydrogen from acids? 12
542 Which of them is a property of lanthanides?

This question has multiple correct options
A. High ionization energies
B. Low ionization energies
c. colour
D. None of the above

12
543 Question 4. The E°(M2+/M) value for copper is positive (+0.34 V).
What is possibly the reason for this?
FE
13
12
544 ( K M n O_{4} ) on treatment with conc.
( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) forms a compound ( (X) ) which
decomposes explosively on heating forming (Y). The (X) and (Y) are respectively:
A. ( M n_{2} O_{7}, M n O_{2} )
В. ( M n_{2} O, M n_{2} O_{3} )
c. ( M n S O_{4}, M n_{2} O_{3} )
D. ( M n_{2} O_{3}, M n O_{2} )
12
545 Question 1. Write down the electronic configuration of
(i) Cr3+ (ii) Pm3+
(iii) Cu
(iv) Ce+
(v) Co2+ (vi) Lu2+ (vii) Mn2+ (viii) Th4+
Recall the atomic number of each element and write their electronic
configuration then, remove the electrons from the outer most shell
according to positive charge present on the ion.
12
546 Which of the following ion will give colourless aqueous solution?
A ( . N i^{2} )
B. ( S c^{3} )
( c cdot C u^{2} )
D. ( M n^{3+} )
12
547 Lanthanide ions show
A. magnetic properties
B. coloured ion formation
c. lanthanide
D. All of the above
12
548 . 61 Assertion (A) Actinoids form relatively less stable complexes as
compared to lanthanoids.
Reason (R) Actinoids can utilise their 5f orbitals alongwith 6d orbitals
in bonding but lanthanoids do not use their 4f orbital for bonding.
12
549 German silver alloy contains:
A. Zinc, silver and copper
B. Nickel, silver and copper
C. Germanium, silver and copper
D. Zinc, nickel and copper
12
550 The position in the periodic table to which the ( A l ) metal belongs:
A. Alkali metals
B. Alkaline earth metals
c. ( d ) – block elements
D. ( p ) -block elements
12
551 Give the electron configuration of the given metal (atom/ions)
( boldsymbol{C r}^{mathbf{3}+} )
( mathbf{A} cdot[A r] 3 d^{1} 4 s^{2} )
B ( cdot[A r] 3 d^{2} 4 s^{1} )
c. ( [A r] 3 d^{3} )
D. none of these
12
552 Which of the following is paramagnetic?
A ( cdot V(C O)_{6} )
в. ( F e(C O)_{5} )
c. ( F e_{2}(C O)_{9} )
D. ( operatorname{Cr}(text {CO})_{6} )
12
553 The outer electronic configuration of transitional elements is:
A ( cdot(n-1) s^{2} n d^{1-2} )
B ( cdot(n+1) s^{2} n d^{1-5} )
C ( cdot(n-1) s^{2} n p^{6}(n-1) d^{1-10} n s^{1,2} )
D ( cdot n s^{2}(n-1) d^{1-10} )
12
554 Which of the following is a Lanthanide element?
A . Ac
B. Al
c. Nd
D. Pd
12
555 Question 1. Silver atom has completely filled d-orbitals (4219) in it
ground state. How can you say that it is a transition element?
Transition elements have incomplete d-orbital in its any oxidation state
+2 state of Ag atom has incomplete 4d-orbital.
pridation state exhibit
12
556 Order of paramagnetic character among following elements is/are:
This question has multiple correct options
( mathbf{A} cdot M n>F e>C r )
в. ( F e>Z n>C r )
c. ( C r>F e>Z n )
( mathrm{D} cdot mathrm{Cr}>mathrm{Mn}>mathrm{Fe} )
12
557 A transition element ( X ) has a
configuration ( [A r] 3 d^{4} ) in its +3 oxidation state.
Its atomic number is not:
This question has multiple correct options
A . 25
B . 26
c. 22
D. 19
12
558 Question 20. On the basis of lanthanoid contraction, explain the
followin Nature of boncitability of oxasanthanoids.
(1) Nature of bonding in La203 and Lu203.
(ii) Trends in the stability of oxosalts of lanthanoids from La to Lu.
(iii) Stability of the complexes of lanthanoids.
(iv) Radii of 4d and 5d-block elements.
(v) Trends in acidic character of lanthanoid oxides.
12
559 Which one of the lanthanoids is
radioactive in nature?
A . cs
B. Np
( c cdot c e )
D. Pm
12
560 Write any four applications of ( ^{prime} f^{prime}- ) block
elements.
12
561 R. 58 Match the properties given in Column 1 with the metals given in
Column II.
Column!
Column
(Property)
Weta
A Element with highest second lorisation enthalpy
Element with highest third lonisation enthalpy
C Min M(CO), is
D. Element with highest heat of atomisation
5. N
12
562 The atomic numbers of elements of
second inner transition elements lie in
the range of :
( A cdot 88 ) to 101
B. 89 to 102
( c cdot 90 ) to 103
D. 91 to 104
12
563 How will you obtain pure potassium
permanganate ( left(boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4}right) ) crystals from
its ore, pyrolusite? Give the steps involved and the reactions.
12
564 Which of them is a characteristic of
lanthanides?
This question has multiple correct options
A. Dissolve in hot water
B. React with acids
c. React with other non-metals
D. Are non-metals
12
565 Write two similarities between
chemistry of lanthanoids and actinoids.
12
566 Which is more stable in the below
given pair?
( M n_{2} O_{7}_{-}-_{-}–R e_{2} O_{7} )
A ( cdot M n_{2} O_{7}=R e_{2} O_{7} )
в. ( M n_{2} O_{7}R e_{2} O_{7} )
D. None of these
12
567 The stoichiometric coefficient of
manganese dioxide in the balanced
chemical reaction when potassium
permanganate is added to a hot
solution of manganous sulphate is
12
568 0.35 Transition elements show high melting points. Why?
nition elements show high
12
569 Assertion
( Y b^{+2} ) is more stable in compare to
( G d^{+2} )
Reason
The electron configuration of ( G d ) is
( [boldsymbol{X} boldsymbol{e}] boldsymbol{4} boldsymbol{f}^{7} boldsymbol{5} boldsymbol{d}^{2} boldsymbol{6} boldsymbol{s}^{2} )
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
570 The oxidation state of copper changes
when aqueous copper (II) ions react with:
( (I) N a O H(a q) )
( (I I) F e(s) )
( (I I I) K I(a q) )
A. ( I, I I, I I I )
B. II only
c. ( I I, I I I )
D. I only
12
571 The first and last elements of actinides
are:
A. Actinium and Thorium
B. Actinium and Nobelium
c. Actinium and Mendelevium
D. Actinium and Lawrencium
12
572 The composition of turbid suspension
(B) and the white precipitate (C) are respectively.
A ( cdot operatorname{Sn} C l_{2}, operatorname{Sn}(O H)_{2} )
в. ( operatorname{Sn}(O H) C l, quad N a_{2} Z n O_{2} )
c. ( operatorname{Sn}(O H) C l, operatorname{Sn}(O H)_{2} )
D. ( operatorname{Sn}(O H) C l, ) SnCl ( _{4} )
12
573 Statement 1: Transition metal
compounds are often colored.
Statement 2: They frequently possess partially filled d-orbitals.
A. Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement1
B. Both the Statement 1 and Statement 2 are correct, but Statement 2 is NOT the correct explanation of Statement 1.
c. Statement 1 is correct, but Statement 2 is not correct
D. Statement 1 is not correct, but Statement 2 is correct
12
574 ( K M n O_{4} ) can be prepared from
( K_{2} M n O_{4} ) as per the reaction:
( mathbf{3} M n O_{4}^{2-}+2 H_{2} O rightleftharpoons 2 M n O_{4}^{-}+ )
( M n O_{2}+4 O H^{-} )
The reaction can go to completion by
removing ( boldsymbol{O H}^{-} ) ions by adding:
A. ( H C l )
в. КОН
( mathrm{c} cdot mathrm{CO}_{2} )
D. ( S O_{2} )
12
575 Statements that are true of d-and ( f- )
block elements are:
1. The colour of ( K_{2} C r_{2} O_{7} ) is due to d-d
transition.
2. Actinides have larger number of oxidation states than lanthanides.
3. Tripositive ions of ( operatorname{Pr}(text { At. } N o .=59) )
and ( T m(A t . N o .=69) ) have the same
(green) colour.
4. Actinides have paramagnetic moments less than theoretically predicted values.
A. 2,3,4
B. 1,2,3
( c cdot 2,4 )
D. 1,2,4
12
576 Which of the following compound is expected to be coloured?
A. ( A g_{2} S O_{4} )
в. ( C u F_{2} )
c. ( M g F_{2} )
D. cucl
12
577 The fusion of chromite ore ( left(F e C r_{2} O_{4}right) )
with ( N a_{2} C O_{3} ) in air gives a yellow
solution upon addition of water. Subsequent treatment with ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} )
produces an orange solution. The yellow and orange colours, respectively, are due to the formation of:
A. ( N a_{2} C r O_{4} ) and ( N a_{2} C r_{2} O_{7} )
в. ( operatorname{Cr}(O H)_{3} ) and ( N a_{2} C r_{2} O_{7} )
c. ( C r_{2}left(C O_{3}right)_{3} ) and ( F e_{2}left(S O_{4}right)_{3} )
D. ( operatorname{Cr}(O H)_{3} ) and ( N a_{2} C r O_{4} )
12
578 Transition metals are less reactive than
alkali metals because they have:
A. high ionisation potential and low melting point
B. high ionisation potential and high melting point
c. low ionisation potential and low melting point
D. low ionisation potential and high melting point
12
579 A transition element ( X ) has a
configuration ( [A r] 3 d^{4}, ) in its +3 oxidation state. Its atomic number is:
A . 25
B. 26
c. 22
D. 19
12
580 Write the uses of Lanthanides. 12
581 The atomic radii of cerium and
promethium are quite similar because
A. they belong to the same period in periodic table
B. they have similar electronic configuration
C. f-orbitals have poor shielding effect
D. nuclear charge is higher on cerium than promethium
12
582 The general electronic configuration of d-block element is ( (n-1) d^{1-10} n s^{1-2} )
where ( n ) is the outer most shell.

However, palladium does not follow this general electronic configuration. It has an electron configuration ( [boldsymbol{K} boldsymbol{r}]^{36} boldsymbol{4} boldsymbol{d}^{10} boldsymbol{5} boldsymbol{s}^{0} )
in order to have stability. Give a reason behind it.

12
583 The numbers of d-electrons retained in
( F e^{2+}(text { atomic number } F e=26) ) ion is:
( A cdot 3 )
B. 4
( c .5 )
D. 6
12
584 (a) Account for the following:
(i) ( C u^{+} ) is unstable in an aqueous
solution.
(ii) Transition metals form complex compounds.
(b) Complete the following equations:
( boldsymbol{C r}_{2} boldsymbol{O}_{7}^{2-}+boldsymbol{8} boldsymbol{H}^{+}+boldsymbol{3} boldsymbol{N} boldsymbol{O}_{overline{2}} rightarrow )
12
585 Assertion
The purple colour of ( K M n O_{4} ) is due to
the charge transfer transition.
Reason
The intense colour in most of the
transition metal complexes is due to
( boldsymbol{d}-boldsymbol{d} ) transition.
A. Both Assertion and Reason are correct and Reason is
the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
586 A larger number of oxidation states are exhibited by the actinides than those by the lanthanides.
The main reason being:
A. more reactive nature of the actinides than the lanthanides
B. ( 4 f ) orbitals are more diffused than the ( 5 f ) orbital
c. lesser energy difference between ( 5 f ) and ( 6 d ) orbitals than between ( 4 f ) and ( 5 d ) orbital
D. more energy difference between ( 5 f ) and ( 6 d ) orbitals than between ( 4 f ) and ( 5 d ) orbitals
12
587 Copper forms two chlorides ( C u C l ) and
( boldsymbol{C u} boldsymbol{C l}_{2} )
(a) Identify the copper ions in these compounds?
(b) What is the valency of copper in each of these compounds?
(c) By writing the sub-shell electronic configuration of copper, find out a subshells from which the electrons are lost
to form these ions.
(d) Write the period and group to which
copper belongs.
(Hint: Atomic number of copper ( =mathbf{2 9} ) )
12
588 Highest oxidation State of manganese in fluorides is ( +4left(M n F_{4}right) ) but highest
oxidation state in oxides is ( +7left(M n_{2} O_{7}right) ) because:
A. fluorine is more electronegative than oxygen
B. fluorine does not possess d-orbitals
c. fluorine stabilises lower oxidation state
D. in covalent compounds, fluorine can form single bond only while oxygen forms double bond
12
589 Addition of non-metals like ( B ) and ( C ) to
the interstitial sites of a transition
metal results the metal:
This question has multiple correct options
A. of more ductability
B. of less ductability
c. Less malleable
D. of more hardness
12
590 Why do transition elements show variable oxidation state?

Explain their catalytic properties in details.

12
591 The main reason for larger number of oxidation state exhibited by the actinides than that corresponding lanthanide, is:
A. lesser energy difference between ( 5 f ) and ( 6 d ) orbital than between ( 4 f ) and ( 5 d ) -orbital
B. larger atomic size of actinides than the lanthanides
C. more energy differenc between 5f and 6d orbitals than between 4f and 5d-orbitals
D. greater reactive nature of the actinides than the lanthanides
12
592 Knowing that the chemistry of lanthanids ( (mathrm{Ln}) ) is dominated by its +3
oxidation state, which of the following statements are correct?
(1) The ionic sized of ( L n(| I) ) decreases in general with increasing atomic
number.
(II) ( mathrm{Ln}(mathrm{III}) ) compounds are generally colourless.
(III) ( operatorname{Ln}(| I) ) hydroxides are mainly basic in character
(IV) Because of the large size of the Ln
(III) ions, the bonding in its compounds is predominently ionic in character.
A. I, III and III
B. II, III and IV
c. ।, ॥ and IV
D. I, III and IV
12
593 Which of the following has the maximum number of unpaired delectrons?
A ( cdot F e^{2} )
в. ( C u^{+} )
( c cdot Z n )
D. ( N i^{3} )
12
594 Which of the following can be oxidised
by acidified ( boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7} ? )
A. Nitrate ions
B. Sulphite ions
c. Ferric ions
D. Borate ions
12
595 Maximum oxidation state of uranium
and plutonium are respectively:
A. 4 and 6
B. 5 and 6
( c .6 ) and 7
D. 6 and 8
12
596 Which metal is used to make alloy steel for armour plates, safes and helmets?
( A cdot A )
в. мп
c. ( mathrm{cr} )
D. Pb
12
597 What is oxidation number of ( C r ) in
( C r O_{5} ) or ( C r Oleft(O_{2}right)_{2} ? )
12
598 General electronic configuration of
lanthanides are:
( mathbf{A} cdot(n-2) f^{1-14}(n-1) s^{2} p^{6} d^{0-1} n s^{2} )
B ( cdot(n-2) f^{10-14}(n-1) d^{0-1} n s^{2} )
C ( cdot(n-2) f^{0-14}(n-1) d^{10} n s^{2} )
D. ( (n-2) f^{0-1}(n-1) f^{1-14} n s^{2} )
12
599 Q. 31 Although +3 is the characteristic oxidation state for lanthanoids but
cerium also shows +4 oxidation state because
(a) it has variable ionisation enthalpy
(b) it has a tendency to attain noble gas configuration
(c) it has a tendency to attain fº configuration
(d) it resembles Pb4+
12
600 Give balanced equations for the following reactions?
Acidifed potassium permanganate and oxalic acid.
12
601 The white anhydrous copper sulphate is heated to high temperature, it gives:
A ( cdot C u S O_{4} cdot 5 H_{2} O )
в. ( C u S O_{4} . H_{2} O )
c. ( C u S O_{4}+S O_{3} )
D. ( C u O )
12
602 Consider the following statements and arrange in the order of true/false as
given in the codes.
( mathrm{S}_{1}: mathrm{Mn}^{2+} ) compounds more stable than
( mathrm{Fe}^{2+} ) towards oxidation to their +3
states.
( mathrm{S}_{2}: ) Titanium and copper both in the first series of transition metals exhibits
+1 oxidation state most frequently.
( mathbf{S}_{3}: mathbf{C u}^{+} ) ion is stable in aqueous
Solution
A. TTF
B. T F F
( mathbf{c} . ) T ( F T )
D. F FT
12
603 Select the correct statement(s).
This question has multiple correct options
A. Transition metals and many of their compounds show paramagnetic behaviour.
B. The enthalpies of atomisation of the transition metals are low.
C. The transition metals generally form coloured compounds.
D. Transition metals and their many compounds act as good catalyst.
12
604 Consider the following list of reagents:
Acidified ( boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7}, ) alkaline
( boldsymbol{K} boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4}, boldsymbol{C u} boldsymbol{S} boldsymbol{O}_{4}, boldsymbol{H}_{2} boldsymbol{O}_{2}, boldsymbol{C l}_{2}, boldsymbol{O}_{2}, boldsymbol{F e C l} )
and ( N a_{2} S_{2} O_{3} . ) The total number of
reagents that can oxidise aqueous iodide to iodine is:
12
605 Actiniod contraction is more than
lanthanold contraction because:
A. energy of 4 f and 5f orbitals are same
B. 5 forbitals are more diffused as compared to 4 f orbitals
c. actinoids show greater range of oxidation states than lanthanoids
D. actinoids are highly reactive
12
606 The correct order of ionic radii of ( mathrm{Ce}, mathrm{La} )
Pm, and Yb in +3 oxidation state is:
( mathbf{A} cdot L a^{3+}<P m^{3+}<C e^{3+}<Y b^{3+} )
B ( cdot Y b^{3+}<P m^{3+}<C e^{3+}<L a^{3+} )
( mathbf{c} cdot L a^{3+}<C e^{3+}<P m^{3+}<Y b^{3+} )
D. ( Y b^{3+}<C e^{3+}<P m^{3+}<L a^{3+} )
12
607 Statements that are true of transition
and inner transition metals are :
This question has multiple correct options
A. osmium is the heaviest transition metal
B. ( C u^{+}left(3 d^{10}right) ) is more stable than ( C u^{2+}left(3 d^{9}right) ) in aqueous medium
C . actinides are generally strong reducing agents
D. ( Y, L a ) and ( A c ) exhibit variable valency
12
608 In neutral or faintly alkaline medium, thiosulphate is quantitatively oxidized
by ( K M n O_{4} ) to:
( mathbf{A} cdot S O_{3}^{2-} )
B. ( S O_{4}^{2-} )
( c cdot s O_{2} )
D. ( S O_{5}^{2-} )
12
609 Which lanthanide compound is used as a pigment?
A. ( C e O_{2} )
B. ( operatorname{Ce}(O H) )
c. ( L u(O H)_{3} $ )
D. ( operatorname{Tb}(O H)_{3} )
12
610 Use hund’s rule to derive the electronic
configuration of ( C e^{+3} ) ion, and calculate
its magnetic moment on the basis of ‘spin only’ formula. ( For ( mathrm{Ce}, mathrm{Z}=58 ) )
12
611 Discuss the consequences of
lanthanide contraction.
12
612 Fit
0.47 The second and third rows of transition elements resemble each other
much more than they resemble the first row. Explain, why?
12
613 Arrange the following ions in order of increasing strength as a reducing agent, and account for the trend:
A ( cdot C r^{2+}<C r_{2} O_{7}^{2-}<C r^{3+} )
B. ( C r^{2+}<C r^{3+}<C r_{2} O_{7}^{2} )
c. ( C r_{2} O_{7}^{2-}<C r^{3+}<C r^{2} )
D. ( C r_{2} O_{7}^{2-}<C r^{2+}<C r^{3+} )
12
614 Oxidation state of Iron in Hemoglobin is:
( A cdot+2 )
( B cdot+4 )
( c cdot+6 )
D.
12
615 The separation of Lanthanoids by ion exchange method is based on
A. basicity of the hydroxides
B. size of the ions
c. the solubility of their nitrates
D. oxidation state of the ion
12
616 Which of following is not correctly matched?
A. d-block element: electronic configuration is ( n s^{0-2}(n-1) d^{1-1} )
B. p-block element : electronic configuration is ( n s^{2} n p^{1-6} )
C. s-block element: electronic configuration is ( n s^{1-2} )
D. None of these
12
617 Which of the following compounds is not coloured?
A ( cdot N a_{2}left[C u C l_{4}right] )
B . ( N a_{2}left[C d C l_{2}right] )
( mathbf{c} cdotleft[operatorname{Cr}left(H_{2} Oright)_{6}right] C l_{3} )
D. all of the above
12
618 Highly volatile metal is:
( A cdot v )
B. cr
( c . ) мn
D. zn
12
619 Lanthanoids are
A. 14 elements in the sixth period(atomic number ( =90 ) to
103) that are filling 4f-sublevel
B. 14 elements in the seventh period(atomic number ( =90 ) to 103 ) that are filling ( 5 f ) -sublevel
C. 14 elements in the sixth period(atomic number ( =58 ) to
71) that are filling ( 4 f ) -sublevel
D. 14 elements in the seventh period(atomic number ( =58 ) to 71 ) that are filling ( 4 f ) -sublevel
12
620 NCERT LI
Q. 13 Gadolinium belongs to 4f series. Its atomic
following is the correct electronic configuration
(a) [Xej4f75d’6s?
(c) [Xe]4fºod?
Ane Cal Godolipili
number 64 The correct electronic
Senes. Its atomic number is 64. Which of…
ectronic configuration of gadolinium?
(b) [Xe]4f65d26s?
(d) [Xe]4fºss’
12
621 Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii?
A. ( z r(40) ) and ( H f(72) )
B. ( operatorname{Zr}(40) ) and ( operatorname{Ta}(73) )
c. ( operatorname{Ti}(22) ) and ( z r(40) )
D. ( z r(40) ) and ( N b(41) )
12
622 A transition element containing only one electron in ( 4 s ) -orbital is:
A ( cdot_{21} mathrm{Se} )
В. ( _{23} M n )
( mathbf{c} cdot_{26} F e )
D・ ( _{29} C u )
12
623 Assertion
Copper dissolves in dilute nitric acid but not in dilute ( boldsymbol{H} boldsymbol{C l} )
Reason

Copper has positive ( boldsymbol{E}^{circ} )
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect

12
624 Q.51 Reactivity of transition elements decreases almost regularly
Cu. Explain.
enthalpies As we
12
625 ( A n^{3+} ) (trivalent actinoid ions) have
configuration
A ( .5 f^{0} ) to ( 5 f^{14} )
B. ( 5 f^{1} ) to ( 5 f^{14} )
( mathbf{c} cdot 5 f^{2} ) to ( 5 f^{1} )
D. ( 5 f^{0} ) to ( 5 f^{13} )
12
626 46 A solution of KMnO4 on reduction yields either a colourless solution or a
brown precipitate or a green solution depending on pH of the solution.
What different stages of the reduction do these represent and how are
they carried out?
12
627 The highest magnetic moment is shown
by the transition metal ion with outer electronic configuration:
A ( cdot d^{9} )
B . ( d^{7} )
( c cdot d^{5} )
( mathbf{D} cdot d^{3} )
12
628 us fe of Cu is +0.34V while that of Zn is–0.76 V. Explain. 12
629 The titanium (atomic number ( =22 ) )
compound that does not exist is :
A . ( T i O )
в. ( T i O_{2} )
( mathrm{c} . K_{2} T i O_{4} )
D. ( K_{2} T i F_{6} )
12
630 The highest oxidation state shown by
transition element is :
This question has multiple correct options
( A cdot+7 ) by ( mathrm{Mn} )
B. +8 by Os
( mathbf{c} cdot+8 ) by Ru
D. +7 by ( mathrm{Fe} )
12
631 Select a ferromagnetic material from the following?
A. Dioxygen
B. Chromium (IV) oxide
c. Benzene
D. Dihydrogen monoxide
12
632 Red lead is:
( mathbf{A} cdot P b O )
( mathbf{B} cdot P b O_{2} )
( mathbf{C} cdot P b_{3} O_{4} )
( mathbf{D} cdot P b_{2} O_{4} )
12
633 What happens when sulphur dioxide gas is passed through an aqueous solution of a Fe(III) salt? 12
634 .69 Mention the type of compounds formed when small atoms like H, C and N
get trapped inside the crystal lattice of transition metals. Also give
physical and chemical characteristics of these compounds.
Ali
12
635 Chemically Zinc group elements closely
resemble
A. I A group
B. II A group
c. III A group
D. IV A group
12
636 Assertion
( boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7} ) is generally preferred over
( N a_{2} C r_{2} O_{7} ) in volumetric analysis
although both are oxidizing agents.
Reason
( N a_{2} C r_{2} O_{7} ) is deliquescent in nature.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is
not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
637 Assertion
Transition metals are good catalysts.
Reason
Transition metals have variable
oxidation state.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Assertion is incorrect but Reason is correct
12
638 Select the incorrect reaction from the
following.
( mathbf{A} cdot 2 N a_{2} C r O_{4}+H^{+} rightarrow N a_{2} C r_{2} O_{7}+2 N a^{+}+H_{2} O )
B. ( 4 M n O_{2}+4 K O H+O_{2} rightarrow 4 K M n O_{4}+2 H_{2} O )
( mathbf{c} cdot 2 M n O_{4}^{-}+5 C_{2} O_{4}^{2}+16 H^{+} rightarrow 2 M n^{2+}+10 C O_{2}+8 H_{2} O )
D. ( M n O_{4}^{-}+8 H^{+}+5 F e^{2+} rightarrow 5 F e^{3+}+M n^{2+}+4 H_{2} O )
12
639 Transition metals are good catalytic
agent. Why?
12
640 Which one of the following ions has
electronic configuration ( [mathrm{Ar}] 3 mathrm{d}^{6} ? )
( A cdot N i^{3} )
B. ( mathrm{Mn}^{3+} )
( mathbf{c} cdot mathrm{Fe}^{3} )
( D cdot c_{0}^{3} )
12
641 ( C r O_{2}^{2+} ) is the cation from:
A. ( C r O )
в. ( C r_{2} O_{3} )
c. ( C r O_{5} )
D. ( operatorname{Cr} mathrm{O}_{3} )
12
642 Potassium permanganate is:
A. purple solution
B. brown-orange liquid
C. green gas
D. silver-gray liquid
E . yellow-orange when burned in a flame
12
643 When ( M n O_{2} ) is fused with ( mathrm{KOH} ) and
( K C l O_{3}, ) a coloured compound is formed, the product and its colour is:
A ( cdot K_{2} M n O_{4}, ) green
B . ( K M n O_{4} ), purple
c. ( M n_{2} O_{3} ), brown
D. ( M n_{3} O_{4} ), black
12
644 The calculated spin-only magnetic moments (BM) of the anionic and
cationic species of ( left[boldsymbol{F} eleft(boldsymbol{H}_{2} boldsymbol{O}right)_{6}right]_{2} ) and
( left[boldsymbol{F e}(boldsymbol{C} boldsymbol{N})_{mathbf{6}}right], ) respectively, are:
A .4 .9 and 0
B. 2.84 and 5.92
c. 0 and 4.9
D. 0 and 5.92
12
645 Q. 41 Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. Why?
Ane ce Prand Ald
12
646 IL
PONDID
Question 31. Use Hund’s rule to derive the electronic configuration of
Cet ion, and calculate its magnetic moment on the basis of ‘spin only
formula.
(1) Write the configuration of Ce and Ce 3+.
(ii) Find the number of unpaired electrons and calculateu.
12
12
647 The element with atomic number 111
might belong to which of the following group?
A. Chromium
B. Scandium
c. copper
D. Titanium
12
648 Variable valency in general is shown by :
A. gaseous elements
B. non-metals
c. s-block elements
D. d-block elements
12
649 Question 10. Although Zr belongs to 4d and Hf belongs to 5d transition
series but it is quite difficult to separate them. Why?
.
12
650 General electron configuration of d-block
elements is:
( mathbf{A} cdot n s^{2} n p^{6} n d^{1-10} )
B ( cdot(n-1) d^{1-10} n s^{0-2} n p^{0-6} )
( mathbf{c} cdot(n-1) d^{1-10} n s^{1-2} )
( mathbf{D} cdot n d^{1-9} n s^{0-2} )
12
651 The reactivity of ( mathrm{Cu}, mathrm{Ag} ) and ( mathrm{Au} ) decreases in the order:
A. ( C u>A g>A u )
в. ( A u>A g>C u )
c. ( A g>A u>C u )
D. ( A g>C u>A u )
12
652 Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other
in
A ( cdot T i^{+}, T i^{3+} )
в. ( C u^{+}, C u^{2+} )
c. ( C r^{2+}, C r^{3+} )
D. ( V^{2+}, V O^{2+} )
12
653 Which of the two have almost similar
size?
В. ( _{41} N b ) and ( _{73} T a )
( mathbf{c} cdot_{39} Y ) and ( _{57} L a )
D. ( _{20} C a ) and ( _{31} I r )
12
654 Consider the following statements with respect to lanthanides:
1. The basic strength of hydroxides of
lanthanides increases from ( boldsymbol{L} boldsymbol{a}(boldsymbol{O} boldsymbol{H})_{3} )
to ( boldsymbol{L} boldsymbol{u}(boldsymbol{O} boldsymbol{H})_{3} )
2. The lanthanide ions
( L u^{3+}, Y b^{2+} ) and ( C e^{4+} ) are diamagnetic.
Which of the statement(s) given above is/are correct?
A. 1 only
B. 2 only
c. Both 1 and 2
D. Neither 1 nor 2
12
655 Select the coloured and paramagnetic ions.
A ( cdot C u^{+}, Z n^{2+}, C a^{2+} )
B ( cdot S c^{3+}, T i^{4+}, V^{5+} )
c. ( C u^{2+}, C r^{+}, M n^{2+} )
D. ( N i^{2+}, C u^{+}, H g^{2+} )
12
656 Thermal decomposition of a ( M n ) compound ( (X) ) at ( 513 K ) results in
compound ( Y, M n O_{2} ) and a gaseous
product. ( M n O_{2} ) reacts with ( N a C l ) and
concentrated ( H_{2} S O_{4} ) to give a pungent
( operatorname{gas} Z )
( X, Y ) and ( Z, ) respectively.
( mathbf{A} cdot K_{2} M n O_{4}, K M n O_{4} ) and ( S O_{2} )
B . ( K_{2} M n O_{4}, K M n O_{4} ) and ( C l_{2} )
c. ( K_{3} M n O_{4}, K_{2} M n O_{4} ) and ( C l_{2} )
D. ( K M n O_{4}, K_{2} M n O_{4} ) and ( C l_{2} )
12
657 Fill in the blank:
Inner transition elements exhibit
different coloured compounds on
account of unfilled orbitals.
( A )
B. f
( c cdot d )
( D )
12
658 The electronic configuration of
gadolinium is:
( mathbf{A} cdot[X e] 4 f^{3} 5 d^{5} 6 s^{2} )
( mathbf{B} cdot[X e] 4 f^{6} 5 d^{2} 6 s^{2} )
( mathbf{c} cdot[X e] 4 f^{8} 5 d^{9} 6 s^{2} )
( mathbf{D} cdot[X e] 4 f^{7} 5 d^{1} 6 s^{2} )
12
659 Which of them can be used as a
catalyst?
A. Neodymium phosphide
B. Cerium phosphate
c. Praseodymium oxide
D. Neodymium(III) nitrate
12
660 Which of the following is diamagnetic ion?
A ( . Z n^{2} )
the ( ^{2} n^{n^{n}} )
B. ( N i^{2} )
( c cdot C o^{2} )
D. ( C u^{2} )
12
661 The chemistry of the actinoids is not so smooth as that of the lanthanoids.
Justify this statement by giving some examples from the oxidation state of these elements.
12
662 Pyrolusite is ( M n O_{2} ) used to prepare
( K M n O_{4} . ) Steps are:
( M n O_{2} stackrel{I}{longrightarrow} M n O_{2}^{2-} stackrel{I I}{longrightarrow} M n O_{4}^{-} )
Steps ( I ) and ( I I ) are respectively:
This question has multiple correct options
A. fuse with ( K O H / ) air, electrolyte oxidation
B. fuse with ( K O H / K N O_{3} ), electrolyte oxidation.
c. fuse with concentrated ( H N O_{3} ) /air, electrolytic reduction
D. dissolve in ( H_{2} O ) oxidation
12
663 The only element that exhibits positive SRP value is
A.
B. zn
c. ( mathrm{Fe} )
D. cu
12
664 What is “Tailing of Mercury” 12
665 What is the oxidation state of coloured
ion in ( left[boldsymbol{C u}left(boldsymbol{N} boldsymbol{H}_{3}right)_{4}right]^{2+} ? )
12
666 Q. 42 Match the following species with their corresponding ground state
electronic configuration.
Atom/lon
Electronic configuration
A. CU
1. 1s 2s 2p 3s 3p%3d0
B. Cu²+
2. 1s 2s 2p 3s 3p 3d 104s?
C. Zn²+
3. 1s 2s 2p 3s 3p%3d1045
4. 1s 2s 2p 3s 3p 3d
5. 1s 2s 2p 3s 3p®3d3
D.
Cr3+
12
667 Fe is made passive by:
A ( cdot ) dil. ( H_{2} S O_{4} )
B. dil. НСl
c. conc. ( H N O_{3} )
D. conc. ( H_{2} ) SO ( _{4} )
12
668 The atomic number of an element ( ^{prime} M^{prime} )
is ( 26 . ) How many electrons are present in
the M-shell of the element in its ( M^{3+} )
state?
A . 11
B . 15
c. 14
D. 13
12
669 Question 13. How is the variability in oxidation states of transition
metals different from that of non-transition metals? Illustrate with
examples.
12
670 The family of elements which consists of atoms that have valence electrons in
a ( d ) subshell is:
A. alkali metals
B. alkaline earth metals
c. noble gases
D. halogens
E. transition metals
12
671 Ona
Ouestion 18. When a chromite ore (A) is fused with sodium carbon.
in free excess of air and the product is dissolved in water, a yello
solution of compound (B) is obtained. After treatment of this yello
solution with sulphuric acid, compound (C) can be crystallised from the
solution. When compound (C) is treated with KCl, orange crystals of
compound (D) crystallise out. Identify A to D and also explain the
reactions.
12
672 Titanium oxide is added in interior
paints for walls of rooms, halls and galleries to give:
( A ). a whiter ‘white’
B. a greener’green’
c. a redder’red
D. silver-white
12
673 The general configuration ( (n-1) d^{3} n s^{2} )
indicates that the particular element belongs to ( _{-}- ) – – ( – ) group.
A . II B
B. IB
c. ( vee ) в
D. III B
12
674 Answer the following:What is lanthanoid contraction?
Mention one of its consequences.
12
675 The lanthanoid ion which contains
unpaired electrons is:
A ( cdot C e^{4} )
в. ( Y b^{2} )
c. ( L u^{3} )
D. ( E u^{2} )
12
676 0.64 Identify A to E and also explain the reaction involved.
OUCO,
CUO
heat with us
(D)
I Ca(OH),
HNO, (conc.)
(Milky)
CO2
NH, (aq)
Ca(HCO3)2
Clear solution
Blue solution
12
677 Balanced reaction ( : 2 mathrm{MnO}_{4}^{-}+mathrm{I}^{-}+mathrm{H}_{2} mathrm{O} )
( rightarrow 2 mathrm{MnO}_{2}+2 mathrm{OH}^{-}+mathrm{IO}_{3}^{-1} )
If true enter 1 else 0
( A )
12
678 A reduction in atomic size with
increase in atomic number is a
characteristic of elements of:
A. d-block
B. f-block
c. radioactive series
D. high atomic masses
12
679 ( K M n O_{4} ) solution is:
A . red
B. purple
c. orange
D. green
E. blue
12
680 Which of the following lanthanoid ions is diamagnetic ? (At. No. ( C e= )
( mathbf{5 8}, boldsymbol{S m}=mathbf{6 2}, boldsymbol{E u}=mathbf{6 3}, boldsymbol{Y b}=mathbf{7 0}) )
A ( cdot C e^{2} )
B . ( S m^{2+} )
c. ( E u^{2+} )
D. ( Y b^{2} )
12
681 Following are the transition metal ions
of ( 3 d ) series:
( boldsymbol{T} boldsymbol{i}^{4+}, boldsymbol{V}^{2+}, boldsymbol{M} boldsymbol{n}^{3+}, boldsymbol{C} boldsymbol{r}^{3+} )
(Atomic numbers: ( boldsymbol{T} boldsymbol{i}=mathbf{2 2}, boldsymbol{V}= )
( mathbf{2 3}, boldsymbol{M n}=mathbf{2 5}, boldsymbol{C r}=mathbf{2 4}) )
Answer the following:
(i) Which ion is most stable in an aqueous solution and why?
(ii) Which ion is a strong oxidising agent and why?
(iii) Which ion is colourless and why?
12
682 The silver salts like ( A g B r ) and ( A g I ) are coloured because of:
A. d-d transition of electrons
B. charge transfer
C. polirisation of halid ( A g^{+} ) by
D. both (b) and (c)
12
683 When acidified ( K_{2} C r_{2} O_{7} ) solution is
added to ( S n^{2+} ) salts, then ( S n^{2+} ) changes
to:
( A cdot S n )
в. ( S n^{3} )
( c cdot s n^{4} )
D. ( S n^{+} )
12
684 The number of occupied subshell in
( C r^{3+} ) ions is:
( A cdot 3 )
B. 4
( c cdot 5 )
D. 6
12
685 Lanthanides and actinides are
recognised as?
A. s- block element
B. d-block element
c. f-block element
D. p-block element
12
686 Which of the following reactions is not
correct?
( mathbf{A} cdot M n O_{4}^{-}+8 H^{+}+5 F e^{2+} rightarrow 5 F e^{3+}+M n^{2+}+4 H_{2} O )
B ( cdot 2 M n O_{2}+4 K O H+O_{2} rightarrow 4 K M n O_{4}+2 H_{2} O )
( mathbf{c} cdot 2 N a_{2} C r O_{4}+2 H^{+} rightarrow N a_{2} C r_{2} O_{7}+2 N a^{+}+H_{2} O )
D. ( K_{2} C r_{2} O_{7}+7 H_{2} S O_{4}+6 K I rightarrow 4 K_{2} S O_{4}+ )
( C r_{2}left(S O_{4}right)_{3}+3 I_{2}+7 H_{2} O )
12
687 Which of the following statement(s) is/are not correct?
A ( cdot L a_{2}(O H)_{3} ), is less basic than ( L u_{2}(O H)_{3} )
B. In Lanthanoid series ionic radius of ( operatorname{Ln} ) n ( 3^{wedge} ) + ions decreases
c. La is actually an element of transition series rather than Lanthanoid series
D. Atomic radii of Zr and Hf are same because of Lanthanide contraction
12
688 Question 4.
Transition elements show high melting points. Why?
12
689 Which of the following has tendency to ( operatorname{act} ) as an oxidising agent?
( A cdot C e^{4} )
B. ( mathrm{Sm}^{2+} )
( c cdot L u^{3} )
D. ( operatorname{Gd}^{3} )
12
690 The size of Mo is very similar to:
A . ( L a )
в. ( H f )
( c . T a )
D. ( W )
12
691 In aqueous solution ( boldsymbol{E} boldsymbol{u}^{2+} ) acts as
A. an oxidsing agent
B. reducing agent
c. can act as either of these
D. can act as redox agent
12
692 The Lanthanoid have the genera
configuration
A ( cdot 5 f^{1-14} 5 s^{2} p^{6} d^{0-1} 6 s^{2} )
B . ( (n-2) f^{1-14}(n-1) d^{1-2} n s^{2} )
( mathbf{c} cdot 5 f^{1-14} 6 s^{2} p^{6} 6 s^{2} )
D. ( n s^{2} n p^{1-6} )
12
693 Which one of the following is ‘ ( d ) -block element?
A. ( G d )
в. ( H s )
c. ( E s )
D. ( C s )
12
694 Which of the following process does not
occur during the formation of ( boldsymbol{C H C l}_{3} )
from ( C_{2} H_{5} O H ) and ( C a O C l_{2} ? )
A. Hydrolysis
B. Oxidation
c. Reduction
D. chlorination
12
695 Question 36. Comment on the statement that elements of the first
transition series possess many properties different from those of heavier
transition elements.
12
696 The colour of ( C u_{2} C r_{2} O_{7} ) solution in
water is :
A. green
B. blue
c. orange
D. black
12
697 How would you account for the following:
(i) Among lanthanoids, ( ln (| I) ) compounds are predominant. However, occasionally in solution or in solid compounds, +2 and +4 ions are also obtained.
(ii) The ( E_{M^{2+} / M}^{o} ) for copper is positive ( (0.34 mathrm{V}) . ) Copper is the only metal in the first series of transition elements
showing this behavior.
(iii) The metallic radii of the third (5d)
series of transition metal are nearly the same as those of the corresponding members of the second series.
12
698 Pyrolusite is ( M n O_{2} stackrel{I}{rightarrow} M n O_{4}^{2-} stackrel{I I}{rightarrow} )
( M n O_{4} )
Steps I and II are respectively:
This question has multiple correct options
A. fuse with KOH / air and electrolytic oxidation.
B. fuse with ( K O H / K N O_{3} ) and electrolytic oxidation.
c. fuse with conc. ( H N O_{3} / a i r ) and electrolytic reduction.
D. dissolve in ( H_{2} O ) and oxidation
12
699 Magnetic moments of ( boldsymbol{C r}(boldsymbol{Z}=mathbf{2 4}) )
( operatorname{Mn}(Z=25) ) and ( F e(Z=26), ) are
( boldsymbol{x}, boldsymbol{y}, boldsymbol{z} )
They are in order:
A. ( x<y<z )
В. ( x=yy>z )
D. ( x=y=z )
12
700 The general electronic configuration of f-block elements is:
A ( cdot(n-2) f^{1-14}(n-1) d^{0-1} n s^{2} )
B . ( (n-2) f^{1-14}(n-1) d^{0-10} n s^{1} )
C. ( (n-2) f^{1-10}(n-1) d^{0-1} n s^{2} )
D ( cdot(n-2) f^{1-14}(n-1) d^{0-1} n s^{1} )
12
701 (a) How would you account for the following:
(i) The chemistry of actinoids is more complicated as compared to lanthanoids
(ii) Transition metals form complex
compounds
(b) Complete the following equation:
[
mathbf{2} M n O_{4}^{-}+6 H^{+}+S O_{3}^{2-} longrightarrow
]
12
702 Cerium ( (z=58) ) is an important member of the Lanthanides. Which of
the following statements about cerium is incorrect?
A. The +3 oxidation state of cerium is more stable than the +4 oxidation state
B. The common oxidation states of cerium are +3 and +4
c. Cerium (IV) acts as an oxidizing agent
D. The +4 oxidation state of cerium is not known in solutions
12
703 Which of the following are correct
statements?

This question has multiple correct options
A. In less acidic solution ( K_{2} C r_{2} O_{7} ) and ( H_{2} O_{2} ) gives violet
coloured diamagnetic ( left[mathrm{CrO}left(mathrm{O}_{2}right)(mathrm{OH})right]^{-} ) ion
B. In alkaline ( H_{2} O_{2}, K_{2} C r O_{8} ) (with tetraperoxo species ( left.left[C r Oleft(O_{2}right)(O H)right]^{3-}right) ) is formed
C. In Ammoniacal solution, ( left(N H_{3}right) C r O_{4} ) is formed
D. ( C r O_{4}^{2-} ) changes to ( C r_{2} O_{7}^{2-} ) by oxidation

12
704 Statement 1: Lanthanides have much
less tendency to form complexes than
actinides.

Statement 2: Compared to actinides, the lanthanides have relatively larger size of atoms and less nuclear charge.
A. Statement 1 is True, statement 2 is True, statement 2 is a correct explanation of statement 1.
B. Statement 1 is True, statement 2 is True, statement 2 is not a correct explanation of statement 1
c. Statement 1 is true, Statement 2 is False
D. Statement 1 is False, Statement 2 is True

12
705 Assertion
The ( 4 f- ) and ( 5 f ) – inner transition series of
elements are placed separately at the bottom of the periodic table.
Reason
(i) This prevents the undue expansion of the periodic table i.e., maintains its
structure.
(ii) This preserves the principle of classification by keeping elements with similar properties in a single column.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Assertion is incorrect but Reason is correct
12
706 0.38 When a brown compound of manganese (A) is treated with HCl it gives a
gas (B). The gas taken in excess, reacts with NH2 to give an explosive
compound (C). Identify compounds A, B and C.
Thinline
12
707 Transition metals and their compounds
catalyse reactions because:
A. they have completely filled ( s ) – subshell.
B. they have a comparable size due to poor shielding of d-subshell.
C. they introduce an entirely new reaction mechanism with lower activation energy.
D. they have variable oxidation states.
12
708 The oxidation state of chromium in the
final product formed by the reaction between KI and acidified potassium
solution is:
( A cdot+4 )
B. +6
( c cdot+2 )
( D cdot+3 )
12
709 Which of the following is paramagnetic as well as coloured ion?
A ( cdot C u^{+} )
в. ( C u^{2} )
( c cdot S c^{3} )
D. ( T i^{4} )
12
710 From the below-given pairs, which is more stable?
( boldsymbol{C r} boldsymbol{O}_{4}^{2-}-ldots-boldsymbol{M o} boldsymbol{O}_{4}^{2-} )
A ( cdot C r O_{4}^{2-}=M o O_{4}^{2-} )
B . ( C r O_{4}^{2-}M o O_{4}^{2-} )
D. None of these
12
711 Q. 42 Although Zr belongs to 4d and Hf belongs to 5d transition series but it is
quite difficult to separate them, Why?
12
712 The Lanthanoid contraction refers to
decrease in the:
A. valence electrons of the Lanthanide series
B. ionic radius of the series
c. the density of the series
D. nuclear mass of the series
12
713 In the following electronic configuration
( n s^{2}(n-1) d^{0-1}(n-2) f^{1-14} . ) If value
of ( (boldsymbol{n}-mathbf{1})=mathbf{6} ) the configuration will be
of:
A. lanthanides
B. d- block
c. actinides
D. s – block
12
714 The aqueous solution of the following
salts will be colored in the case of
This question has multiple correct options
( mathbf{A} cdot Z nleft(N O_{3}right)_{2} )
( mathbf{B} cdot L i N O_{3} )
( mathbf{c} cdot operatorname{Co}left(N O_{3}right)_{2} )
( mathbf{D} cdot C r C l_{3} )
12
715 If the following ion(s) is/are coloured
enter ( 1, ) else enter 0
( boldsymbol{C} boldsymbol{a}^{2+} )
12
716 What are the different oxidation states
exhibited by the lanthanoids?
12
717 Question 5. How would you account for the irregular variation of
ionisation enthalpies (first and second) in the first series of the transition
elements?
12
718 What is the correct order of the covalent
size of Cr and Mo?
A. ( mathrm{cr}=mathrm{Mo} )
B. CrsMo
( c cdot c r>M o )
D. None of these
12
719 Increasing basic properties of
( T i O_{2}, Z r O_{2} ) and ( H f O_{2} ) are in order:
A. ( T i O_{2}<Z r O_{2}<H f O_{2} )
в. ( H f O_{2}<Z r O_{2}<T i O_{2} )
c. ( H f O_{2}<T i O_{2}<Z r O_{2} )
D. ( Z r O_{2}<T i O_{2}<H f O_{2} )
12
720 Which of the following is the most basic?
A ( cdot C e(O H)_{3} )
в. ( L u(O H)_{3} )
( mathbf{c} cdot Y b(O H)_{3} )
D. ( A l(O H)_{3} )
12
721 Assertion
( Z r ) and ( H f ) occur together in nature and are difficult to separate.
Reason
( Z r ) and ( H f ) have identical radii due to lanthanide contraction.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
722 Lanthanide are:
A. 14 element in the sixth period (atomic no. ( =90 ) to 103 ) that are filling ( 4 f ) -sublevel
B. 14 element in the seventh period (atomic no. ( =90 ) to
103) that are filling 5f-sublevel
C. 14 element in the sixth period (atomic no. ( =58 ) to 71 ) that are filling ( 4 f ) -sublevel
D. 14 element in the seventh period (atomic no. ( =58 ) to 71 ) that are filling ( 4 f ) -sublevel
12
723 The inner transition elements are the
elements in which the added electrons
go to:
( A cdot(n-1) d- ) orbitals
B. (n-2) f-orbitals
c. (n-1) d-orbitals and (n-1) f-orbitals
D. (n-1) d-orbitals and ns orbitals
12
724 The colour of ( M n O_{4}^{-} ) ion is due to
charge transfer.
If true enter 1 , else enter 0 .
12
725 Formula for argentite, horn silver and
pyragyrite are respectively?
( mathbf{A} cdot A g_{2} S, A g C l ) and ( A g_{3} S b S_{3} )
B. ( A g C l, A g_{3} S b S_{3} ) and ( A g_{2} S )
( mathbf{c} cdot A g_{3} S b S_{3}, A g_{2} S ) and ( A g C l )
D. ( A g C l A g_{2} S ) and ( A g_{3} S b S_{3} )
12
726 Transition metals have the general
electronic configuration?
A ( cdot n s^{2} n d^{1-10} )
В ( cdot n s^{2} n p^{1}(n-1) d^{1-10} )
c. ( n s^{1-2}(n-1) d^{1-10} )
D. ( n s^{2} n p^{6}(n-1) d^{1-1} )
12
727 Give one point of dissimilarity between lanthanides and actinides. 12
728 Due to lanthanide
contraction
A. Fe, Co, Ni have equal size
B. Zr and Hf have equal size
C. all f-block ions have equal size
D. all isoelectronic ions have equal size
12
729 Which substance does not possess a
peroxy cyclic ring?
( mathbf{A} cdot mathrm{CrO}_{5} )
( mathbf{B} cdot B a O_{2} )
( mathbf{c} cdot H_{2} S_{2} O_{8} )
D. All have peroxy linkage
12
730 Most oxidsing agent is:
( mathbf{A} cdotleft[W O_{4}right]^{2-} )
B. ( left[mathrm{CrO}_{4}right]^{2-} )
c. ( left[mathrm{Ce} mathrm{O}_{4}right]^{2} )
D. ( left[M n O_{4}right]^{2-} )
12
731 Which one of the following species is stable in aqueous solution
A ( cdot M n O_{4}^{2} )
в. ( M n O_{4}^{3} )
( c cdot C r^{2} )
D. ( C u^{+} )
12
732 The actinoids exhibit more number of
oxidation states in general than
lanthanoids because:
A. the ( 5 f ) orbitals are more buried than the 4 f orbitals
B. there is a similarity between ( 4 f ) and ( 5 f ) orbitals in their angular part of the wave function
C. the actinoids are more reactive than the lanthanoids
D. the ( 5 f ) orbitals extend further from the nucleus than
the ( 4 f ) orbitals
12
733 18 When acidified K Cr,0, solution is added to Sn2+ salt then Sn2 changes
to
way
sn
(a) Sn
o
b Snaio
(c) Sn 4+
(b) Sni+
(d) Sn+
12
734 46. Which of the following metals has
least melting point ?
(1) Gold (2) Silver
(3) Mercury (4) Copper
12
735 For ( Z n^{2+}, N i^{2+}, C u, ) and ( C r^{2+} ) which of
the following statements is correct?
A. only ( Z n^{2+} ) is colourless and ( N i^{2+}, C u^{2+} ) and ( C r ) are coloured
B. All the ions are coloured
c. All the ions are colourless
D. ( Z n^{2+} ) and ( C u^{2+} ) are colourless while ( N i^{2+} ) and ( C r^{2+} ) are coloured
12
736 What is the best reagent would you choose to convert ( M n O_{4}^{2-} ) to ( M n O_{4}^{-} ? )
A ( cdot C l_{2} ) water
в. ( O_{3} )
c. Both ( A ) and ( B )
D. None of these
12
737 Identify the incorrect statement among
the following.
A. Lanthanide contraction is the accumulation of
successive shrinkages.
B. As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no
similarities with the ( 5 mathrm{d} ) series of elements.
C. Sheilding power of 4f electrons is quite weak.
D. There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
12
738 Lanthanoids contraction is observed in:
A. ( H f )
в. ( A t )
( c cdot X e )
D. ( A c )
12
739 If ( K M n O_{4} ) is reduced by oxalic acid in an acidic medium, then the oxidation
number of ( M n ) changes from:
A. +4 to +2
B. +6 to +4
( c cdot+7 t o+2 )
D. +7 to +4
12
740 Discuss the consequences of
lanthanide contraction.
12
741 The electronic configuration of
actinides is:
A ( cdot[operatorname{Rn}] 5 f^{0-14} 6 d^{0-2} 7 s^{1} )
B . ( [R n] 5 f^{0-14} 6 d^{0} 7 s^{0} )
C ( cdot[R n] 5 f^{0-14} 6 d^{0-2} 7 s^{2} )
D cdot ( [R n] 5 f^{0-14} 6 d^{0-2} 7 s^{0} )
12
742 Cholrine gas is produced from HCl by the addition of:
A. ( K_{2} S O_{4} )
в. КСl
c. ( K N O_{3} )
D. ( K M n O_{4} )
12
743 The correct statement(s) about ( C r^{2+} )
and ( M n^{3+} ) is(are):
[Atomic numbers of ( mathbf{C r}=mathbf{2 4} ) and ( mathbf{M n}= )
This question has multiple correct options
A. ( C r^{2+} ) is a reducing agent
B. ( M n^{3+} ) is an oxidizing agent
c. Both ( C r^{2+} ) and ( M n^{3+} ) exhibit ( d^{4} ) electronic configuration
D. When ( C r^{2+} ) is used as a reducing agent, the chromium ion attains ( d^{5} ) electronic configuration
12
744 Pick out the correct statement(s):
This question has multiple correct options
( mathbf{A} cdot M n O_{2} ) dissolves in conc. ( H C l ) but does not form ( M n^{4+} )
ions.
B. Decomposition of acidic ( K M n O_{4} ) is not catalysed by sunlight
C ( . M n O_{4}^{2-} ) is strongly oxidising and stable only in a very strong alkali. In dilute alkali, water or acidic solutions it dispropotionates.
D. ( K M n O_{4} ) does not act as oxidising agent in alkaline medium.
12
745 Potassium dichromate in alkaline
solution, with ( 30 % mathrm{H}_{2} mathrm{O}_{2} ) produces:
A ( cdot K_{3} C r O_{8} )
в. ( operatorname{Cr} mathrm{O}left(mathrm{O}_{2}right)_{2} )
( mathrm{c} cdot mathrm{CrO}_{3} )
D. ( L_{2} ) Cr ( O_{4} )
12
746 Explain why:
Zr and Hf exhibit similar properties.
(At. no. of ( mathrm{Zr}=40, mathrm{Hf}=72) )
12
747 In which of the following Lanthanoids oxidation state +2 is most stable?
A . ( mathrm{c} )
B. Eu
( c cdot T b )
D. Dy
12
748 Magnetic moment of ( F e^{3+} ) ions ( sqrt{35} )
BM. Determine number of unpaired electrons.
12
749 The electronic configuration of a
transition element ‘ ( X^{prime} ) in +3 oxidation
state is ( [A r] 3 d^{5} . ) What is its atomic
number?
A .24
B . 25
( c cdot 26 )
D. 27
12
750 What is the oxidation state of ( C r ) in
( boldsymbol{C r} boldsymbol{O}_{5} ? )
12
751 In which of the following pairs are both the ions coloured in aqueous solution?
[At. No. ( : S c=21, T i=22, N i= )
( mathbf{2 8}, boldsymbol{C u}=mathbf{2 9}, boldsymbol{C o}=mathbf{2 7}] )
A ( cdot N i^{2+}, T i^{3+} )
B. ( S c^{3+}, T i^{3+} )
( mathbf{c} cdot S c^{3+}, C o^{2+} )
D. ( N i^{2+}, C u^{+} )
12
752 Among ( mathrm{K}, mathrm{Ca}, mathrm{Fe} ) and ( mathrm{Zn}, ) the elements which can form more than one binary compound with chlorine is:
( A cdot F e )
B. zn
( c cdot k )
D. ca
12
753 Select the correct order of ions with
respect to their ionic radii.
A. ( Y^{3+}<L u^{3+}<E u^{3+}<L a^{3+} )
B . ( L u^{3+}<Y^{3+}<E u^{3+}<L a^{3+} )
c. ( L u^{3+}<E u^{3+}<L a^{3+}<Y^{3+} )
D. ( L a^{3+}<E u^{3+}<L u^{3+}<Y^{3+} )
12
754 What are the constituents of
‘Mischmetal’?
A. ( L a, F e )
в. ( L a, C e )
c. ( F e, C e )
D. Ce.Cu
12
755 Compare thermal stability of ( Z n O )
( C d O ) and ( H g O )
A. ( Z n O>C d O>H g O )
в. ( C d O>Z n O>H g O )
c. ( Z n O>H g O>C d O )
D. ( H g O>Z n O>C d O )
12
756 The position in the periodic table to which ( F e ) and ( Z n ) elements belong to
A . Alkali metal
B. Alkaline earth metal
c. d-block
D. None of these
12
757 ( N a^{+} ) is coloured.
If the given statement is correct enter 1
else enter 0
12
758 ( boldsymbol{X}+boldsymbol{K}_{2} boldsymbol{C O}_{3}+ ) Air ( stackrel{text {heat}}{longrightarrow}(boldsymbol{Y}) )
( boldsymbol{Y}+boldsymbol{C l}_{2} rightarrow boldsymbol{Z}(text { pink }) )
Which of the following is correct?
A. ( X= )Black,MnO( _{2} ; Y= )Blue,K( _{2} )Cr( O_{4} ; Z=K M n O_{4} )
B. ( X= )Green, ( C r_{2} O_{3} ; Y= )Yellow,K( _{2} C r O_{4} ; Z= )
( K_{2} C r_{2} O_{7} )
c. ( X= )Black,MnO( _{2} ; Y= )Green, ( K_{2} ) Mn ( O_{4} ; Z= )
( K M n O_{4} )
D. ( X= )Black, Bi( _{2} ) O( _{3} ; Y= )Colourless, KBiO( _{2} ; Z= )
( K B i O_{3} )
12
759 Question 14. The halides of transition elements become more covalent
with increasing oxidation state of the metal. Why?
12
760 In the laboratory, ( M n O_{2} ) is made by:
A. heating ( M n ) in ( O_{2} )
B. oxidising ( M n^{2+} )
C. electrolytic oxidation of ( M n S O_{4} )
D. titration of ( K M n O_{4} ) in alkaline medium
12
761 ( T i^{4+} ) ion is colourless. Give reason 12
762 Which of the following exhibits only +3 oxidation state?
A. ( T h )
в. ( A c )
( c . P a )
D. ( U )
12
763 ( C u^{2+} ) is stable in aqueous medium due
to
A . ( d^{10} ) configuration
B. ( d^{9} ) configuration
c. ( I P_{2}>I P_{1} )
D. Hydtation energy overcomes the other endothermic processes
12
764 Question 8. Although Cr3+ and Co-+ ions have same number of
unpaired electrons but the magnetic moment of Cris 3.87 BM and the
of Co2+ is 4.87 BM Why?
12
765 In the general electronic configuration, ( (n-2) f^{1-14}(n-1) d^{01} n s^{2}(text { where } n=7) )
the configuration will be of:
A. lanthenides
B. actinides
c. transition elements
D. none
12
766 Statement 1: An element that has an
electron configuration of ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} 4 s^{2} ) is a transition
element.
Statement 2: The transition elements
from scandium to zinc are filling the ( 3 d )
orbitals.
A. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.
B. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.
c. Statement 1 is correct but Statement 2 is not correct.
D. Statement 1 is not correct but Statement 2 is correct.
E. Both the Statement 1 and Statement 2 are not correct.
12
767 Q. 60 Assertion (A) Separation of Zr and Hf is difficult.
Reason (R) Because Zr and Hf lie in the same group on
Table.
12
768 Q.5 On addition of small amount of KMnO to concentrated H2304
compound is obtained which is highly explosive in nature. tuen
compound from the following.
(a) Mn 07
(b) MnO₂
(c) MnSO4 (d) Mn203
12
769 What is the oxidation state of coloured
ion in ( left[boldsymbol{C o}left(boldsymbol{H}_{2} boldsymbol{O}right)_{6}right]^{3+} ? )
12
770 Which of the following pair have almost
similar size
A ( cdot T i_{22} ) and ( Z r_{4} )
B. ( N b_{41} ) and ( T a_{73} )
C ( cdot Y_{39} ) and ( L a_{57} )
D. ( C a_{20} ) and ( I r_{r} )
12
771 Which of the follwing is the correct electronic configuration of
( boldsymbol{F} boldsymbol{e}^{+3} boldsymbol{i o n}left(boldsymbol{Z}_{boldsymbol{F} e}=boldsymbol{2} boldsymbol{6}right) ? )
( mathbf{A} cdot[A r] 3 d^{6} )
B . ( [A r] 3 d^{5} )
( mathbf{c} cdot[A r] 3 d^{6} 4 s^{2} )
D cdot ( [A r] 3 d^{6} 4 s^{1} )
12
772 Experimental value of magnetic
momentum of ( M n^{2+} ) complex is 5.96
B.M. This indicates:
A. Axial and orbital motion of electron in same direction
B. Axial and orbital motion of electron in opposite direction
C. Electron does not exhibit orbital motion, it only exhibits axial motion
D. Electron does not exhibit axial motion, it only exhibits orbital motion
12
773 Assertion
Reduction potential of ( M n(+3 t o+2) ) is more positive than ( boldsymbol{F e}(+boldsymbol{3} text { to }+mathbf{2} ) ).
Reason
lonisation potential of ( M n ) is more than
that of ( F e )
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
774 Oxidation states shown by lanthanoids is/are
This question has multiple correct options
( A cdot+2 )
B. +3
( c cdot+4 )
D. None of these
12
775 The reason for greater range of oxidation states in actinoids is
attributed to:
A. ( 4 f ) and ( 5 d ) levels being close in energies.
B. the radioactive nature of actinoids
c. actinoid contraction.
D. ( 5 f, 6 d ) and ( 7 s ) levels having comparable energies
12
776 form oxocations.
A. Lanthanides
B. Actinides
c. Noble gas
D. Alkali metalss
12
777 Which of the following is least basic?
A ( cdot L a(O H)_{3} )
( mathbf{B} cdot L u(O H)_{3} )
c. ( operatorname{Ce}(O H)_{3} )
D. ( N d(O H)_{3} )
12
778 Why are metals like chromium and
molybdenum very hard?
12
779 S
ALA PIOLET
Question 5. What may be the stable oxidation state of the transition
element with the following d-electron configuration in the ground state of
their atoms : 3d, 3d, 3d8 and 3d”?
12
780 Larger number of oxidation states are
exhibited by the actinoids than those by the lanthanoids, the main reason being:
A. more reactive nature of the actinoids than the lanthanoids
B. 4f orbitals more diffused than the 5 f orbitals
c. more energy difference between 5 5 and ( 6 d ) than between 4 f and 5d orbitals
D. lesser energy difference between 5 and ( 6 d ) than between ( 4 mathrm{f} ) and ( 5 mathrm{d} ) orbital
12
781 Cerium shows oxidation state of +4
because:
( mathbf{A} ). it resembles alkali metals
B. it has very low I.E.
C. it has tendency to attain noble gas configuration
D. it has tendency to attain ( f^{0} ) configuration
12
782 Which of the following elements is placed just after actinide series? This question has multiple correct options
A. Rutherfordium
B. Unnilpentium
c. Unnilquadium
D. Ununbium
12
783 Which of the following statements is
not correct?
( mathbf{A} cdot L a(O H)_{3} ) is less basic than ( L u(O H)_{3} )
B. In lanthanide series, radii of elements decreases with an increase in atomic number
C . ( L a ) is actually an element of transition series rather than lanthanides
D. Atomic radii of ( Z r ) and ( H f ) are same because of lanthanide contraction
12
784 Which one of the following ions is the most stable in aqueous solution?
( [A t . text { no.; } T i=22, V-23, C r=24 ; M n=25] )
A ( cdot C r^{3} )
в. ( V^{3} )
( mathrm{c} cdot T i^{3} )
( mathbf{D} cdot M n^{3} )
12
785 The molecular formula of Rinmann’s
green is
A ( . F e S O_{4} 7 H_{2} O )
в. ( C r C l_{3} )
c. ( N i S O_{4} 7 H_{2} O )
D. ( operatorname{CoOZnO} )
12
786 Titanium shows the magnetic moment of 1.73 B.M. in its compound. What is the oxidation number of ( boldsymbol{T} boldsymbol{i} ) in the
compound?
( A cdot+1 )
( B .+4 )
( c cdot+3 )
( D cdot+2 )
12
787 Let, paramagnetism is given by the relation ( mu=2 sqrt{s(s+1)} ) magnetons
where ‘s’ is the total spin. On this basis,
the pramagnetism of ( C u^{+} ) ion is:
A . 3.88 magnetons
B. 2.83 magnetons
c. 1.41 magnetons
D. zero
12
788 The atomic and ionic radii ( left(M^{3+} text { ions }right) )
of Lanthanide elements decrease with
increase in atomic number. This effect
is called as:
A. Lanthanoid contraction
B. Lanthanoid expansion
c. Actinoid contraction
D. none of these
12
789 Ouestion 28. What are inner-transition elements? Decide which of the
following atomic numbers are the atomic numbers of the inner-transition
elements : 29, 59, 74, 95, 102, 104?
(0) Inner-transition means their(n-2) sub shell is filled by electrons.
(ii) Write electronic configuration for all the given atomic numbers. If the
last electron enters in (n-2) of subshell, it is an inner-transition
element, otherwise not.
12
790 Question 3. Which of the 3d series of the transition metals exhibits the
largest number of oxidation states and why?
12
791 Question 32. Name the members of the lanthanoid series which exhibit
+4 oxidation states and those which exhibit +2 oxidation states. Try to
correlate this type of behaviour with the electronic configurations of these
elements.
Empty, half-filled or completely filled shells are more stable than partially
filled shells.
12
792 Ferric sulphate is represented by which formula?
A. ( F e S O_{4} )
в. ( F e S O_{3} )
( mathrm{c} cdot mathrm{Fe}left(mathrm{SO}_{4}right)_{2} )
D. ( F e_{2}left(S O_{4}right)_{3} )
12
793 Give reason:
( left[boldsymbol{T} boldsymbol{i}left(boldsymbol{H}_{2} boldsymbol{O}right)_{6}right]^{3+} ) is coloured while
( left[S cleft(H_{2} Oright)_{6}right]^{3+} ) is colourless
12
794 Why ( Z n^{2+} ) is diamagnetic whereas
( C r^{3+} ) is paramagnetic?
12
795 An organic compound ( [A] ) having
molecular formula ( C_{2} H_{7} N ) on
treatment with nitrous acid gives a
compound ( [boldsymbol{B}] ) having molecular
formula ( C_{2} H_{6} O .[B] ) on treatment with an organic compound ( [C] ) gives a carboxylic acid ( [D] ) and a sweet smelling compound ( [boldsymbol{E}] . ) Oxidation of ( [boldsymbol{B}] ) with acidified potassium dichromate also gives ( [boldsymbol{D}] ) Identify ( [boldsymbol{A}],[boldsymbol{B}],[boldsymbol{C}],[boldsymbol{D}] ) and ( [boldsymbol{E}] )
12
796 General electronic configuration of
lanthanides is:
( mathbf{A} cdot(n-2) f^{1-14}(n-1) d^{0-1} n s^{2} )
B . ( (n-2) f^{10-14}(n-1) d^{10-1} n s^{2} )
C ( cdot(n-2) f^{0-14}(n-1) d^{10} n s^{2} )
D. ( (n-2) d^{0-1}(n-1) f^{1-14} n s^{2} )
12
797 Select the coloured compound amongst the following:
(Atomic no. ( boldsymbol{T} boldsymbol{i}=mathbf{2} 2, boldsymbol{C r}=mathbf{2 4}, boldsymbol{C u}= )
( mathbf{2 9}, mathbf{Z n}=mathbf{3 0} mathbf{)} )
A. ( T i C l_{4} )
в. ( C r C l_{3} )
c. ( Z n C l_{2} )
D. ( C u C l )
12
798 Which of the following group belongs to actinide series?
A. Th, Pa, U
B. Ce Pr, Nd
c. Ва, La, нf
D. Pt, Au, Ag
12
799 Q.9 The elements in which electrons are progressively filled in 4f-orbital are
called
(a) actinoids
(b) transition elements
(c) lanthanoids
und (d) halogens
12
800 2. 16 KMnOacts as an oxidising agent in alkaline medium. When alkaline
KMnO4 is treated with KI, iodide ion is oxidised to ……..
(a) IZ
(b) 10
(c) IO;
(d) IO
12
801 Which one of the following ion exhibits colour in aqueous solution?
( A cdot S c^{3} )
B. Ni2
c. ( T_{i}^{4} )
( D cdot z n^{+2} )
12
802 Which of the following lanthanide is commonly used?
A. Lanthanium
B. Nobelium
c. Thorium
D. Cerium
12
803 What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?
This question has multiple correct options
A ( cdot C r_{2} O_{7}^{2-} ) and ( H_{2} O ) are formed
B . ( C r O_{7}^{2-} ) is reduced to +3 state of ( C r )
( mathrm{c} cdot mathrm{Cr} mathrm{O}_{7}^{2-} ) is oxidized to +7 state of ( mathrm{Cr} )
D. ( C r^{3+} ) and ( C r_{2} O_{7}^{2-} ) are formed
12
804 Q. 66 When an oxide of manganese (A) is fused wi
an oxide of manganese (A) is fused with KOH in the presence of an
ing agent and dissolved in water, it gives a dark green solution of
vound (B). Compound (B) disproportionates in neutral or acidic
? to give purple compound (C). An alkaline solution of compound
( oxidises potassium iodide solution to a compound (D) and compound
(A) is also formed. Identify compounds A to D and also explain the
reactions involved.
12
805 How do you account for the larger size of lanthanum than hafnium though they are successive elements? 12
806 Potassium manganate ( left(mathrm{K}_{2} mathrm{MnO}_{4}right) ) is
formed. When :
This question has multiple correct options
A. cuprous oxide reacts with alkaline ( mathrm{KMnO}_{4} ) solution
B. manganese dioxide is fused with ( mathrm{K}_{2} mathrm{CO}_{3} ) in presence of
( mathrm{KNO}_{3} )
C. formaldehyde reacts with potassium permanganate in presence of concentrated potassium hydroxide solution
D. potassium permanganate is heated with potassium hydroxide
12
807 Identify the oxidation states of titanium ( (Z=22) ) and copper ( (Z=29) ) in their colourless compounds:
A ( cdot T i^{3+}, C u^{2+} )
B. ( T i^{2+}, C u^{2+} )
c. ( T i^{4+}, C u^{+} )
D. ( T i^{4+}, C u^{2+} )
12
808 Correct order of reducing agent, in ( V^{2+} )
or ( C o^{2+} ) is:
A ( cdot V^{2+}=C o^{2+} )
B. ( V^{2+}C o^{2} )
D. none of these
12
809 The only radioactive element among the lanthanoids is:
A. gadolinium
B. holmium
c. promethium
D. neodynium
12
810 Which of the following is the strongest
base?
( mathbf{A} cdot S c(O H)_{3} )
( mathbf{B} cdot L a(O H)_{3} )
c. ( L u(O H)_{3} )
D. ( Y b(O H)_{3} )
12
811 At ( p H=4, C r_{2} O_{4}^{2-} ) exists as:
A ( cdot C r O_{4}^{2-} )
в. ( C r O_{3} )
( mathrm{c} cdot mathrm{Cr} mathrm{O}_{2}^{2+} )
D. ( C r_{2} O_{7}^{2} )
12
812 Select the correct statements:
This question has multiple correct options
A. The +1 oxidation state compared to the +3 oxidation state gets gradually more stabilized as we move from top to bottom in III group.
B. TI (III) being unstable, acts as a good oxidizing agent to get reduced to TI (II).
( mathrm{C} cdot operatorname{Sn} mathrm{Cl}_{2} ) is good oxidizing agent.
D. All are incorrect.
12
813 Write any three salient features of oxidation states of transition elements. 12
814 What are interstitial compounds? Why are such compounds well known for transition metals? 12
815 The number of oxidation states is
exhibited by the actinoids more than by the lanthanide. The main reason for this
is:
A. more energy difference between 5 f and 6 d orbital than that between 4 f and 5 d orbitals.
B. the lesser energy difference between 5 and ( 6 d ) orbital than between ( 4 f ) and ( 5 d ) orbitals
C. the greater metallic character of the lanthanoids than that of the corresponding actinoids
D. more active nature of the actinoids
12
816 Assertion
Equivalent mass of ( K M n O_{4} ) is equal to
one-fifth of its molecular mass when it
acts as an oxidisng agent in acidic medium.
Reason
Oxidation number of ( M n ) in ( K M n O_{4} ) is
+7
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Assertion is incorrect but Reason is correct
12
817 The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition elements which shows
highest magnetic moment?
A ( cdot 3 d^{2} )
B. ( 3 d^{8} )
( c cdot 3 d^{7} )
D. ( 3 d^{5} )
12
818 Which of the following is a lanthanide?
A. Curium
B. Californium
c. Uranium
D. Europium
12
819 The colour imparted by ( operatorname{Co}(boldsymbol{I} boldsymbol{I}) )
compounds to glass is
A. green
B. deep blue
c. yellow
D. red
12
820 Lanthanoid elements have:
A. similar lattice and solvation energies but widely different ionization energies
B. similar lattice and ionization energies but widely different solvation energies
C. similar ionization and solvation energies but widely different lattice energies
D. similar lattice, solvation and ionization energies
12
821 Lanthanoid contraction is caused due
to:
A. the same effective nuclear charge from ( C e ) to ( L u )
B. the imperfect shielding on outer electrons by ( 4 f ) electrons from the nuclear charge
C. the appreciable shielding on outer electrons by ( 4 f ) electrons from the nuclear charge
D. the appreciable shielding on outer electrons by ( 5 d ) electrons from the nuclear charge
12
822 Write one similarity and one difference
between the chemistry of lanthanoids and that of actinoids.
12
823 Define lanthanoid contraction. Explain
its effects.
12
824 Most common oxidation state of Ce
(Cerium) are:
( A cdot+3,+4 )
( B cdot+2,+3 )
( c cdot+2,+4 )
( D cdot+3,+5 )
12
825 Give two reactions in which transition
metals or their compound acts as catalysts.
12
826 Which of the following is the stable
electronic configuration of ( F e^{3+} ) ion?
A ( cdot 3 d^{6} 6 s^{0} )
B. ( 3 d^{5} s s^{0} )
c. ( 3 d^{6} 4 s^{2} )
D. ( 3 d^{4} 4 s^{2} )
12
827 An element with atomic number 21 is a:
A. halogen
B. representative element
c. transition element
D. alkali element
12
828 Due to lanthanide contraction:
A. ( F e, C o, N i ) have equal size
B. ( Z r ) and ( H f ) have equal size
C. all ( f- ) block ions have equal size
D. all isoelectronic ions have equal size
12
829 Identify the correct Structure of
dichromate ion.
( A )
в.
c.
( D )
12
830 Standard reduction potential of most of the transition elements is generally:
A. negative
B. positive
c. zero
D. none of the above
12
831 The oxidising ability of the given anions
follows the order:
A ( cdot operatorname{Ti} 0_{4}^{4-}<V O_{4}^{3-}<C r O_{4}^{2-}<M n O_{4} )
B. ( V O_{4}^{3-}<C r O_{4}^{2-}<M n O_{4}^{-}<T i O_{4}^{4} )
c. ( C r O_{4}^{2-}<M n O_{4}^{-}<V O_{4}^{3-}<T i O_{4}^{4} )
D. ( V O_{4}^{3-}<T i O_{4}^{4-}<C r O_{4}^{2-}<M n O_{4} )
12
832 Which of the following has been arranged in order of increasing bond strength:
A ( cdot Z n_{2}^{2+}<H g_{2}^{2+}<C d_{2}^{2} )
B ( cdot C d_{2}^{2+}<H g_{2}^{2+}<Z n_{2}^{2} )
c. ( Z n_{2}^{2+}<C d_{2}^{2+}<H g_{2}^{2} )
D. ( H g_{2}^{2+}<C d_{2}^{2+}<Z n_{2}^{2+} )
12
833 Which one of the following statements
about lanthanides is false?
A. Lanthanides are separated from one another by ion exchange method
B. The ionic radii of trivalent lanthanides steadily increases with increase in atomic number
C. All lanthanides are highly dense metals
D. Most typical oxidation state of lanthanides is +3
12
834 A salt is made of bivalent ions ( X ) and ( Y )
each of which is capable of decolorizing
acidified ( K M n O_{4} ) solution. The salt is
likely to be:
A. stannic chloride
B. ferric sulphate.
c. ferrous sulphate.
D. ferrous oxalate
12
835 Which one is solid at room
temperature?
A. Nitrogen
B. Potassium permanganate
c. Bromine
D. Helium
12
836 Which of the following oxidation state is common for all lanthanoids?
( A cdot+2 )
( B cdot+3 )
( c cdot+4 )
( D cdot+5 )
12
837 The properties of ( Z r ) and ( H f ) are same because
A. they have similar radii
B. they belong to d-b;ock
C. they have same valence electrons
D. None of the above
12
838 In which of the following Lanthanoids oxidation state +2 is most stable?
A . ( mathrm{c} )
B. Eu
( c cdot T b )
( D cdot D y )
12
839 The outer electronic configuration of radioactive element present in IA group is :
( mathbf{A} cdot 8 s^{1} )
B . ( 7 s^{text {। }} )
c. ( 5 s^{text {। }} )
D. ( 6 s^{text {th }} )
12
840 Silver atom has completely filled d
orbitals ( left(4 d^{10}right) ) in its ground state. How
can you say that it is a transition element?
12
841 The colorless species is:
A. ( V C l_{3} )
в. ( V O S O_{4} )
c. ( N a_{3} V O_{4} )
D ( cdotleft[Vleft(H_{2} Oright)_{6} S O_{4}right] . H_{2} O )
12
842 Assertion
lonic radii of Ta and Nb are same
Reason
The lanthanide contraction cancels
almost exactly the normal size increase on descending a group of transition
elements
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
843 Cr has electronic configuration as:
A ( cdot 3 s^{2} 3 p^{6} 3 d^{1} 4 s^{1} )
B . ( 3 s^{2} 3 p^{6} d^{5} 4 s^{1} )
c. ( 3 s^{2} 3 p^{6} 3 d^{6} )
D. None of the above
12
844 When a brown compound of ( mathrm{Mn}(mathrm{A}) ) is treated with ( H C l, ) it gives a gas B. The
gas B taken in excess reacts with ( N H_{3} ) to give an explosive compound C. The compounds ( A, B ) and ( C ) are :
A. ( A=M n O_{2}, B=C l_{2}, C=N C l_{3} )
В. ( A=M n O, B=C l_{2}, C=N H_{4} C l )
c. ( A=M n_{3} O_{4}, B=C l_{2}, C=N C l_{3} )
D. ( A=M n O_{3}, B=C l_{2}, C=N C l_{2} )
12
845 Non-Lanthanoid atom is:
A . La
B . Lu
( c cdot P r )
D. Pm
12
846 The electronic configuration of ( mathrm{Cu}^{+2} ) is:
A ( cdot(A r) 4 s^{3} 3 d^{10} )
B . ( (A r) 4 s^{3} 3 d^{10} )
c. ( (A r) 3 d^{9} )
D cdot ( (A r) 4 s^{2} 3 d^{7} )
12
847 To what extent do the electronic
configurations decide the stability of oxidation states in the first series of the
transition elements? IIlustrate your
answer with examples.
12
848 In which of the following compounds manganese has an oxidation number
equal to that of iodine in ( K I O_{4} ? )
A. Potassium manganate
B. Potassium permanganate
c. Manganous chloride
D. Manganese chloride
12
849 Which oxides will not give metal on heating?
A. ( H g O )
в. ( Z n O )
c. ( A g_{2} O )
D. All of these
12
850 Which of the following is true regarding derivation of the name of californium?
A. The name of californium was derived from the name of the place.
B. The name of californium was derived from its color.
c. The name of californium was derived from the name of the scientist who discovered it
D. The name of californium was derived from mythological character name.
12
851 The element with the electronic
configuration ( [X e] 4 f^{14} 5 d^{1} 6 s^{2} ) is a:
A. representative element
B. transition element
C . actinide element
D. Lanthanide element
12
852 0.55 Match the statements given in Column I with the oxidation states given
in Column II.
Column 1
Column II
A. Oxidation state of Mnin Mno, is
11. +2
B. Most stable oxidation state of Mnis
2. +3
C. Most stable oxidation state of Mnin oxides is
D. Characteristic oxidation state of lanthanolds is
12
853 When ( S O_{2} ) is passed through acidified
( K_{2} C r_{2} O_{7} ) solution:
A. the solution turns blue.
B. the solution is decolourised
c. ( S O_{2} ) is reduced.
D. green ( C r_{2}left(S O_{4}right)_{3} ) is formed
12
854 Which of the following statement is not
correct?
( mathbf{A} cdot L a(O H)_{3} ) is less basic than ( L u(O H)_{3} )
B. In lanthanide series ionic radius of ( L n^{3+} ) ion
decreases.
C. La is actually an element of transition series rather lanthanide.
D. Atomic radius of Zr and Hf are same because of lanthanide contraction.
12
855
LAULUPUS
0.50 While filling up of electrons in the atomic orhitals, the 4s orbital is
before the 3d orbital but reverse happens during the ionisalo
atom. Explain why?
e happens during the ionisation of the
12
856 The maximum oxidation state of
osmium is:
( A cdot+6 )
B. +7
( c cdot+8 )
D. +5
12
857 Question 2. Why are Mn2+ compounds more stable than Fe2+ towards
oxidation to their +3 state?
Half-filled orbitals are more stable.
12
858 Assertion
The complex ion ( left[C o(e n)_{2} B r_{2}right]^{-} ) has
three stereoisomers.
Reason
The complex ion ( left[C o(e n)_{2} B r_{2}right]^{-} ) has an
octahedral geometry.
A. Both Assertion and Reason are correct and Reason is
the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
859 Which of the following is least basic?
( mathbf{A} cdot L a(O H)_{3} )
( mathbf{B} cdot L u(O H)_{3} )
( mathbf{c} cdot operatorname{Ce}(O H)_{3} )
D. ( N d(O H)_{3} )
12
860 Which of the following elements
involves gradual filling of ( 5 f ) -level?
A. Lanthanoids
B. Actinoids
c. Transition metals
D. Coinage metals
12
861 The oxoanion which contains all
equivalent ( M-O ) bond is:
( (I) C r O_{4}^{2-} )
( (I I) M n O_{4}^{-} )
( (I I I) C r_{2} O_{7}^{2-} )
A. III only
В. ( I, I I, I I I )
c. ( I, I I )
D. I only
12
862 Question 9. Ionisation enthalpies of Ce, Pr and Nd are higher than Tu
Pa and U. Why?
12
863 2PPONY
Q. 71 A violet compound of manganese (A) decompo
oxygen and compounds (B) and (C) of mangan
(0 reacts with KOH in the presence of por
compound (B). On heating compound () with
chlorine gas is liberated and a compound (D) of manganese ato
mpound (D) of manganese alongwith
other products is formed. Identify compounds A to D and also
the reactions involved.
of manganese (A) decomposes on heating to liberate
pounds (B) and (C) of manganese are formed. Compound
KOH in the presence of potassium nitrate to give
on heating compound (C) with conc. H2SO4 and NaCl,
12
864 The most widely used commercial chemical as a paint pigment is:
A ( cdot ) Ti ( O_{2} )
в. ( operatorname{si} 0_{2} )
c. ( M g O )
D. ( A l_{2} O_{3} )
12
865 What is oxidation number of ( C r ) in
( left(N H_{3}right)_{3} C r O_{4} ) or ( left(N H_{3}right)_{3} C rleft(O_{2}right)_{2} ? )
12
866 The transition series that possess
elements with maximum oxidation state
of +8:
A. 1 and 2 series
B. 1 and 3 series
c. 1,2 and 3 series
D. 2 and 3 series
12
867 Explain chromyl chloride test with equation. 12
868 The electronic configuration of cerium
is:
в. ( [X e] 4 f^{1} 5 d^{1} 6 s^{2} )
( mathbf{c} cdot[X e] 4 f^{2} 5 d^{0} 6 s^{2} )
D. Both A and B
12
869 The maximum oxidation state shown by
( M n ) in its compound is :
( A cdot+4 )
B. +5
( c cdot+6 )
D. +7
12
870 Although, Zr belongs to ( 4 d ) and Hf
belongs to ( 5 d ) transition series but it is quite difficult to separate them, why?
12
871 An element ( ^{prime} X^{prime} ) on emitting an ( alpha )
particle, do not change its group number in the periodic table. The element is:
A. lanthanum
B. cerium
c. lawrencium
D. radium
12
872 The ( C r O_{3} ) on reaction with ( H C l ) and
NaOH(aq) gives, respectively:
A ( cdot C r O_{2} C l_{2}, C r O_{4}^{2} )
B. ( operatorname{Cr}(O H)_{2}, C r O_{4}^{2} )
c. ( C l_{2}, C r_{2} O_{7}^{2-} )
D. ( C l_{2}, C r(O H)_{3} )
12
873 Assertion
In transition elements, radii of ( 5 d ) series are virtually the same as those of the
corresponding members of ( 4 d ) series.
Reason
The filling of ( 4 f ) orbitals before ( 5 d ) orbitals results in a regular decrease in atomic radii.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
874 Select correct statement(s).
( mathbf{A} cdot P u^{4+} ) disproportionates to ( P u^{3+} ) and ( P u O_{2}^{2+} ) in strongly acidic solution
B. Maximum oxidation state of Np is +7
( mathrm{C} cdot U mathrm{O}_{2}^{2+} ) is stable
D. All of the above are correct statement
12
875 Nonstoichiometry is shown
A. due to variable valency of transition elements
B. due to to defects in solid structures
C. due to both (a) and (b)
D. due to none of the above
12
876 Which of the following statements is
not correct regarding Lanthanoids and
Actinoids?
A. Oxidation state +3 is predominant in both theseries.
B. In both the series f-orbitals are being progressively filled
C. the elements of both the series are radioactive
D. Both series show contraction as Lanthanide
contraction and actinide contraction.
12
877 ( V^{3+} ) is coloured
If the given statement is true enter 1
else enter 0
12
878 Which of the following is false?
This question has multiple correct options
( mathbf{A} cdot C r^{2+}(g) ) ion has greater magnetic moment compared to ( C o^{3+}(g) )
B. The magnitude of ionization potential of iron an-ion (monoanion) would be equal to electron gain enthalpy of iron.
C. Lanthanoids contraction is cause of lower I.P of ( P b )
than ( S n )
D. If successive ionization energy are ( 332,738,849,4080,4958 text { (in } k J / m o l) ). Then this element can be of 15 th group.
12
879 Identify the order in which the spin only magnetic moment (in BM) increases for the following four ions:
(।) ( boldsymbol{F} boldsymbol{e}^{2+}(|) boldsymbol{T} boldsymbol{i}^{2+}(| boldsymbol{l}) boldsymbol{C} boldsymbol{u}^{2+}(mid V) boldsymbol{V}^{2+} )
A ( . I, I I, I V, I I I )
в. ( I V, I, I I, I I I )
с. ( I I I, I V, I, I I )
D. III, II, IV,
12
880 The oxidation states of central metal
ions of ( (A),(B) ) and ( (C) ) compounds are respectively:
A. ( +11,+ ) VI and ( + ) VII
B. ( +11,+ ) VI and ( +v ) I
c. ( +1 !,+ ) VII and ( + ) vII
D. ( +mathrm{Vl} ), ( + ) VII and ( +mathrm{V} ) I
12
881 An inorganic salt is lemon yellow in colour. It becomes orange in colour like methyl orange when it is acidic and again becomes yellow when it is alkaline. The inorganic salt will be :
A. copper nitrate
B. ferric chloride
c. potassium chromate
D. potassium ferricyanide
12
882 Atomic number 64 will have electronic
configuration:
( mathbf{A} cdot[X e]_{54} 6 s^{2} 4 f^{3} )
В ( cdot[X e]_{54} 6 s^{2} 4 f^{7} 5 d^{1} )
( mathbf{c} cdot[X e]_{54} 4 f^{10} )
( mathbf{D} cdot[X e]_{54} 6 s^{2} 4 f^{7} 5 p^{1} )
12
883 Copper becomes green when exposed to moist air for a long period of time due to
the
A. formation of a layer of cupric oxide on the surface of copper.
B. formation of a layer of basic carbonate of copper on the surface of copper
c. formation of a layer of cupric hydroxide on the surface of copper.
D. none of the above
12
884 a. Why 3 d-series of elements acts as
good catalyst?
b. Given reason: ( boldsymbol{T} boldsymbol{i}^{4+} ) salts are
colourless where as ( C r^{3+} ) salts are
coloured.
12
885 Which sub shell is filled up progressively
in actinoids?
( A cdot 4 f )
B. 5f
( c cdot 6 d )
D. 7s
12
886 Lanthanides are also known as:
A. Transition elements
B. Rare gases
c. coinage metals
D. Rare earths
12
887 The pair of compounds that can exist
together is:
( mathbf{A} cdot F e C l_{3}, S n C l_{2} )
( mathbf{B} cdot H g C l_{2}, S n C l_{2} )
( mathbf{c} cdot F e C l_{2}, S n C l_{2} )
( mathbf{D} cdot F e C l_{3}, K I )
12
888 Write balanced chemical equations for the following reactions:
Oxalic acid is treated with acidified
potassium permanganate solution
12
889 If the following ion is coloured enter 1
else enter 0
( N i^{2+} )
12
890 The incorrect configuration is:
A. ( K=[A r] 4 s^{1} )
B. ( C r=[A r] 3 d^{5}, 4 s^{1} )
c. ( C r=[A r] 3 d^{4}, 4 s^{2} )
D. ( C u=[A r] 3 d^{10}, 4 s^{1} )
12
891 Which of the following statement is not
correct?
A. Fe, Ni, Co form interstetial compound
в. ( C u S O_{4}+C a(O H)_{2} ) is called Bordeaux mixture
c. verdigris is basic copper acetate ( left[C uleft(C O O C H_{3}right)_{2} C u(O H)_{2}right] )
D. 24 carat gold is an alloy of Au and cu
12
892 The +3 ion of which one of the following has half filled ( 4 f ) subshell:
A . ( L a )
в. ( L u )
( c . G d )
D. ( A c )
12
893 ( boldsymbol{S} boldsymbol{c}^{boldsymbol{3}+} ) is colorless.
If the given statement is true enter 1
else enter 0
12
894 More number of oxidation states are
exhibited by the actinoids than by lanthanoids. The main reason for this is:
A. greater metallic character of the lanthanoids than that of the corresponding actinoids.
B. more active nature of the actinoids
c. more energy difference ( 5 f ) and ( 6 d ) -orbitals than that between ( 4 f ) and ( 5 d ) -orbitals
D. lesser energy difference between ( 5 f ) and ( 6 d ) -orbitals than that between ( 4 f ) and ( 5 d ) -orbitals
12
895 Which of the following electronic configuration is associated with the highest stable oxidation state?
( mathbf{A} cdot[A r] 3 d^{1} 4 s^{2} )
B cdot ( [A r] 3 d^{5} 4 s^{1} )
( mathbf{c} cdot[A r] 3 d^{5} 4 s^{2} )
D cdot ( [A r] 3 d^{6} 4 s^{2} )
12
896 Which of the following statement(s)
is/are not correct?
( mathbf{A} cdot L a(O H)_{3} ) is less basic than ( L u(O H)_{3} )
B. In lanthanide series, ionic radius of ( L n^{3+} ) ion
decreases.
C. ( L a ) is actually an element of transition series rather than lanthanides.
D. Atomic radii of ( Z r ) and ( H f ) are same because of lanthanide contraction.
12
897 ( ln left[boldsymbol{F e}(boldsymbol{C N})_{5}left(boldsymbol{N O}^{+}right)right]^{2-}, ) Fe has +3 state
It can be decided by:
A. magnetic measurement
B. colligative property
c. colour
D. hybridisation
12
898 Which is the strongest base among the
following?
( mathbf{A} cdot L a(O H)_{3} )
В. ( L u(O H)_{3} )
( mathbf{c} cdot operatorname{Ce}(O H)_{3} )
D. ( Y b(O H)_{3} )
12
899 Which of the following can convert
acidified ( C r_{2} O_{7}^{2-} ) to green product?
( mathbf{A} cdot S O_{2}, H_{2} S O_{3} ) and ( H_{2} S O_{4} )
B. ( S O_{2}, H_{2} S ) and ( H_{2} S O_{3} )
( mathbf{c} cdot S O_{3}, H_{2} S ) and ( F e^{3+} )
D. ( S O_{3}^{-}, H_{2} S ) and ( F e^{+2} )
12
900 Which of the following ions has same number of unpaired electrons as those present in ( V^{3+} ) ion?
A ( cdot F e^{3} )
B. ( N i^{2} )
c. ( M n^{2} )
D. ( C r^{3} )
12
901 Compare the chemistry of actinoids
with that of the lanthanoids with
special reference to:
(i) electronic
configuration
(ii) atomic and ionic
sizes and (iii) oxidation state (iv)
chemical reactivity.
12
902 What changes occur when acidified ( C r_{2} O_{7}^{2-} ) ion reacts with ( H_{2} O_{2} ) solution
in presence of ether solvent?
A. orange colour of solution turns blue
B. Oxidation state of ( C r ) atom increases
c. oxidation state of ( C r ) atom remains constant
D. Orange colour turns green
12
903 0.59 Assertion (A) Cu + iodide is not known.
Reason (R) Cuc* oxidises I to jodine.
12
904 Elements having atomic number higher
than ( ^{prime} mathbf{9} 2^{prime} ) in the periodic table are
known as:
A. transuranic elements
B. rare earth elements
c. transitional elements
D. alkaline earth metals
12
905 Which of the following is not an actinoid?
A. Curium (Z = 96)
B. Californium (Z = 98)
c. Uranium ( ( z=92 ) )
D. Terbium (Z = 65)
12
906 Iron exhibits +2 and +3 oxidation states
Which of the following statements about iron is incorrect?
A. Ferrous oxide is more basic in nature than the ferric oxide
B. Ferous compounds are relatively more ionic than the corresponding ferric compounds
c. Ferrous compounds are less volatile than the corresponding ferric compounds
D. Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds
12
907 What is the correct order of covalent
size of the following?
( mathrm{Cu} )
A ( . mathrm{Cu}=mathrm{Ni} )
B. cusNi
( c cdot c u>N i )
D. None of these
12
908 Which of the following elements belongs to actinide series?
A . Lu
B. Gd
c. Th
D. La
12
909 The magnetic moment of a transition metal of ( 3 d ) -series is ( 6.92 B M . ) Its
electronic configuration will be:
A ( cdot(3 d)^{4}(4 s)^{2} )
B ( cdot(3 d)^{5}(4 s)^{1} )
( c cdot(3 d)^{10} )
D. ( (3 d)^{5}(4 s)^{0} )
12
910 Which of the following arrangements does not represent the correct order of
the property stated against it?
A ( cdot V^{2+}<C r^{2+}<M n^{2+}<F e^{2+}: ) Paramagnetic behavior
B. ( N i^{2+}<C o^{2+}<F e^{2+}<M n^{2+}: ) lonic size
C. ( C o^{3+}<F e^{3+}<C r^{3+}<S c^{3+}: ) Stability in aqueous solution
D. ( S c<T i<C r<M n ) : Number of oxidation states
12
911 42. Which one of the following is
not a characteristic feature of
alloys ?
They are
(1) Compounds
(2) Mixtures
(3) Solutions
(4) Homogeneous systems
12
912 ( M n O_{4}^{2-}(1 text { mole }) ) in neutral aqueous medium is disproportionate to:
A ( cdot 2 / 3 ) mole of ( M n O_{4}^{-} ) and ( 1 / 3 ) mole of ( M n O_{2} )
B . 1/3 mole of ( M n O_{4}^{-} ) and 2/3 mole of ( M n O_{2} )
c. ( 1 / 3 ) mole of ( M n_{2} O_{7} ) and ( 1 / 3 ) mole of ( M n O_{2} )
D. 2/3 mole of ( M n_{2} O_{7} ) and ( 1 / 3 ) mole of ( M n O_{2} )
12
913 Question 19. Compare the stability of +2 oxidation state for the
elements of the first transition series.
Write the valence shell electronic configuration of first transition series
for M2+. Compare the stability on the basis of half-filled and completely
filled d-orbitals.
12
914 The trend of basicity of lanthanoid
hydroxides:
A. increases across the lanthanoid series
B. decreases across the lanthanoid series
C. first increases and then decreases
D. first decreases and then increases
12
915 The color of ( C o C l_{3} .5 N H_{3} . H_{2} O ) is:
A . red
B. orange
c. orange-yellow
D. pink
12
916 Which of the following is most stable
( operatorname{among} boldsymbol{C u}^{+}, boldsymbol{F e}^{+}, boldsymbol{F e}^{2+}, boldsymbol{a n d} boldsymbol{F e}^{3+} )
A ( cdot C u^{+} )
B. ( F e^{+} )
( mathrm{c} cdot F e^{2} )
D. ( F e^{3} )
12
917 Question 25. Give examples and suggest reasons for the following
features of the transition metal chemistry.
6) The lowest oxide of transition metal is basic, the highest
amphoteric/acidic.
(ii) A transition metal exhibits highest oxidation state in oxides and
fluorides.
Gin) The highest oxidation state is exhibited in oxoanions of a metal.
12
918 Identify a ‘chemical twin’ among the following.
A. Zr-Ta
B. Nb-Tc
c. Hf-Re
D. Nb-Ta
12
919 ( K_{2} C r_{2} O_{7} ) react with hydrazine to form
product. The oxidation state of ( C r ) in the
product will be:
( A cdot+4 )
B. +3
( c .+5 )
D. +2
12
920 The number of unpaired electrons in ferrous ion is:
( A cdot 2 )
B. 3
( c cdot 4 )
D.
12
921 The most common oxidation state of
Lanthanoids is:
( A cdot+4 )
( B cdot+3 )
( c cdot+6 )
( D cdot+2 )
12
922 How is ( C l_{2} ) prepared using ( K M n O_{4} ) 12
923 If ( C O_{2} ) is passed into waste water
containing ( C r O_{7}^{2-} ) (yellow) then:
A. Solution turns green due to formation of ( C r^{3} )
B. Solution turns blue due to formation of ( C r O_{5} )
C. Solution turns orange due to formation of ( C r_{2} O_{7}^{2} )
D. No effect takes place
12
924 A metal ( M ) which is not affected by
strong acids like conc.
( H N O_{3}, ) conc. ( H_{2} S O_{4} ) and conc. solution
of alkalies like ( N a O H, K O H ) forms
( M C l_{3} ) which finds use for toning in
photography. The metal ( M ) is :
A . ( A g )
в. ( H g )
c. ( A u )
D. ( C u )
12
925 What may be the stable oxidation state
of the transition element with the
following d-electron configuration in the ground state of their atoms:
( 3 d^{3}, 3 d^{5}, 3 d^{8} ) and ( 3 d^{4} ? )
12
926 Question 15. Describe the oxidising action of potassium dichromate and
write the ionic equations for its reaction with
(1) iodide (ii) iron (II) solution (iii) HZS
Potassium dichromate being a strong oxidising agent, oxidises (1) into
In. (ii) Fe 2+ into Fe 3+ and (iii) H.S into S and itself gets reduced to Crs+.
12
927 Explain why iron, cobalt, nickel do not show the expected highest oxidation states of +8,+9 and +10 respectively? 12
928 Question 30. Which is the last element in the series of the actinoids?
Write the electronic configuration of this element. Comment on the
possible oxidation state of this element.
Actinoids = 8gAc to 109LF.
12
929 Which of the following is not a member of 3d-transition series?
( A cdot F e )
B. co
c. Au
D. cu
12
930 Assertion
HCl doesn’t used to acidify a ( K M n O_{4} ) solutions in volumetric estimations of
( boldsymbol{F} boldsymbol{e}^{2+} ) or ( boldsymbol{C}_{2} boldsymbol{O}_{4}^{2-} )
Reason
( K M n O_{4} ) oxidizes HCl to ( C l_{2} )
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
931 Lanthanoids contraction is due to
increase in:
A. shielding by ( f ) -electrons
B. atomic number.
c. effective nuclear charge
D. size of 4 f-orbital.
12
932 Which of the following factors may be
regarded as the main cause of
lanthanide contraction?
A. Poor shielding of one of ( 4 f ) electron by another in the subshell
B. Effective shielding of one of 4 f electrons by another in the subshell
C. Poorer shielding of 5d electrons by 4f electrons
D. Greater shielding of 5d electrons by 4f electrons
12
933 Which subshell is filled up
progressively in actinides?
A . ( 4 f )
B. ( 5 f )
c. ( 6 d )
D. ( 7 s )
12
934 The electronic configuration of ( boldsymbol{E} boldsymbol{u} )
(Atomic No. 63 ), ( G d ) (Atomic No. 64 ) and
Tb (Atomic No. 65 ) are :
A ( cdot[X e] 4 f^{7} 6 s^{2},[X e] 4 f^{8} 6 s^{2} ) and ( [X e] 4 f^{8} s d^{1} 6 s^{2} )
B . ( [X e] 4 f^{7} 5 d^{1} 6 s^{2},[X e] 4 f^{7} 5 d^{1} 6 s^{2} ) and ( [X e] 4 f^{9} 6 s^{2} )
C ( cdot[X e] 4 f^{6} 5 d^{1} 6 s^{2},[X e] 4 f^{7} 5 d^{1} 6 s^{2} ) and ( [X e] 4 f^{8} 5 d^{1} 6 s^{2} )
D cdot ( [X e] 4 f^{7} 6 s^{2},[X e] 4 f^{7} 5 d^{1} 6 s^{2} ) and ( [X e] 4 f^{9} 6 s^{2} )
12
935 Write the electronic configurations of the elements with the atomic numbers
( 61,91,101, ) and 109
12
936 Which of the following statement
concerning Lanthanoid is incorrect?
A. All Lanthanoids are highly dense metals.
B. Most characteristic oxidation state of Lanthanide
elements is +3.
C. The ionic radii of trivalent Lanthanides steadily increase with increase in the atomic number
D. Lanthanoids are separated from one another by ion exchange methods
12
937 The basic character of the transition
metal monoxides follows the order:
(Atomic number ( mathrm{Ti}=22, mathrm{V}=23, mathrm{Cr}=24 )
( F e=26) )
A. TiO > Fe0 > VO > cro
в. тio > vo > cro > Feo
c. тio ( > ) Cro ( > ) vo ( > ) Feo
D. crosvo ( > ) Fe0 > Tio
12
938 Select incorrect statement(s).
A. Ionisation energies of 5d-elements are greater than those of ( 3 d ) and ( 4 d ) elements
B. Cu(l) is diamagnetic while Cu(II) is paramagnetic
( mathbf{c} cdotleft[T ileft(H_{2} Oright)_{6}right]^{3+} ) is coloured while ( left[S cleft(H_{2} Oright)_{6}right]^{3+} )
colourless
D. Transition elements cannot form complexes
12
939 Which of the following Actinoid cannot have an electron in 5f-orbital?
A. Uranium
B. Thorium
c. Plutonium
D. Nobelium
12
940 The equivalent weight of ( M n O_{2} ) is equal to its molecular weight when it is converted to:
( mathbf{A} cdot M n_{2} O_{3} )
B. ( M n O )
c. ( M n O_{4}^{2} )
D. ( M n O_{4}^{-} )
12
941 0. 29 Transition elements form binary compou
insition elements form binary compounds with halogens. Which of the
following elements will form MF, type compounds?
(a) Cr
(b) Co
(c) Cu
(d) Ni
12
942 When ( M n O_{2} ) is fused with ( mathrm{KOH} ) and ( O_{2} )
what is the product formed and its
colour?
A. Mno – colourless
B . ( K M n O_{4} ) – purple
C. ( K_{2} M n O_{4} ) – dark green
D. ( M n O_{3} ) – black
12
943 nyarog C
WUCIT UN CICLOU POCITUV.UU.
Question 2. Why E° values of Mn, Ni, Zn are more negative than
expected?
2+
2+
.
:
13f
12
944 Name two metals that do not react with
water at all.
12
945 The electronic configuration of Gd (atomic number ( =mathbf{6 4} ) amu) is:
( mathbf{A} cdot[X e] 4 f^{8} 5 d^{9} 6 s^{2} )
в. ( [X e] 4 f^{7} 5 d^{1} 6 s^{2} )
( mathbf{c} cdot[X e] 4 f^{5} 5 d^{2} 6 s^{2} )
( mathbf{D} cdot[X e] 4 f^{3} 5 d^{3} 6 s^{2} )
12
946 Fe is made passive by:
A ( cdot d i l . H_{2} S O_{4} )
в. dil. ( H C l )
c. ( a q u a-r e )eja ( a )
D. conc.H( _{2} ) SO ( _{4} ),
12
947 The electronic configuration of ( _{59} P r ) (Praseodymium) is?
A ( cdotleft[_{54} X eright] 4 f^{2} 5 d^{1} 6 s^{2} )
B . ( left[_{54} X eright] 4 f^{1} 5 d^{2} 6 s^{2} )
c. ( left[_{54} X eright] 4 f^{3} 6 s^{2} )
D・ ( left[_{54} X eright] 4 f^{3} 5 d^{2} )
12
948 Which is more stable in the below
given pair?
( V^{2+}– )
( boldsymbol{V} boldsymbol{O}_{4}^{3-} )
A ( cdot V^{2+}=V O_{4}^{3-} )
B . ( V^{2+}V O_{4}^{3-} )
D. None of these
12
949 The radius of ( L a^{3+} ) (Atomic number of
( boldsymbol{L} boldsymbol{a}=mathbf{5} mathbf{7}) ) is ( mathbf{1 . 0 6} boldsymbol{A} ) Which one of the
following given values will be closest to the radius of ( L u^{3+} ) (Atomic number of
( boldsymbol{L} boldsymbol{u}=mathbf{7} 1) ? )
A ( .40 A )
в. ( 1.06 A )
c. 0.85
D. ( 1.60 A )
12
950 Which of the following factors may be
regarded as the main cause of
lanthanide contraction?
A. Greater shielding of 5 d-electron by 4 f-electrons
B. Poor shielding of 5 d-electron by 4 f-electrons
c. Effective shielding of one 4 f-electrons by another in the subshel
D. Poor shielding of one of 4-electrons by another in the subshell
12
951 Actinides have higher tendency to form complexes than Lanthanides, due to
A. Higher charge and smaller size
B. Smaller charge and larger size
c. They are radioactive
D. They are electropositive
12
952 In which of the following compounds iron
has the lowest oxidation state?
( mathbf{A} cdot F e(C O)_{5} )
( mathbf{B} cdot F e_{2} O )
( mathbf{c} cdot K_{4}left[F e(C N)_{6}right] )
D ( cdot F e S O_{4} cdotleft(N H_{4}right) S O_{4} cdot 6 H_{2} O )
12
953 Give the electron configuration of the given metal (atom/ions)
( F e O_{4}^{2-}(text { ferrate ion }) )
( mathbf{A} cdot[A r] 3 s^{2} )
B . ( [A r] 4 s^{2} )
c. ( [A r] 3 d^{2} )
D. none of these
12
954 A hydrated colorless solid (A) is water
soluble and finds use in medicine as a
purgative. When a solution of (A) is treated with ammonium phosphate, a white precipitate is formed. (A) gives a pink mass in cobalt nitrate cavity test What is ( (A) ? )
A ( . F e S O_{4} .7 H_{2} )
в. ( N a_{2} S O_{4} .10 H_{2} )
c. ( M g S O_{4} .7 H_{2} O )
D. ( operatorname{CaSO}_{4} .2 mathrm{H}_{2} )
12
955 Variable valency of transition elements is
on account of :
A. incomplete s – orbitals
B. incomplete d – orbitals
C . completely filled d- orbitals
D. incomplete p-orbitals
12
956 The atomic and ionic radii ( left(mathrm{M}^{3+} ) ions) of right.
Lanthanide elements decrease with
increase in atomic number. This effect is
called:
A. Lanthanoid contraction
B. f-fransition
c. Actinoid contraction
D. shielding effect
12
957 Which of the following has pseudo-inert gas configuration in the ( (n-1) ) shell?
A. Typical transition elements
B. Zinc group elements
c. Both of the above
D. None of the above
12
958 A transition metal x has the electronic
configuration [Ar]3d ( ^{4} ) in its +3 oxidation
state. The element is:
A. Mn
B. Fe
c. Ti
D.
12
959 The maximum oxidation state
exhibited by actinide ions is:
( A cdot+5 )
B. +4
( c cdot+7 )
D. +8
12
960 The position in the periodic table to
which the lanthanides and
actinides metals belong:
A. alkali metals
B. alkaline earth metals
c. transition elements
D. inner transition elements
12
961 The following belongs to d-block but it is not transition element
A. Mn
B. Fe
( c cdot z n )
D. cr
12
962 Describe the structure of interstitial
and substitutional alloys and outline the factor determining which is formed.
12
963 The outer shell electronic configuration of ( G d(Z=64) ) is
A ( cdot 4 f^{7} 5 d^{1} 6 s^{2} )
B ( cdot 4 f^{8} 6 s^{2} )
c. ( 4 f^{9} 9 s^{text {। }} )
D. ( 4 f^{7} 5 d^{2} 6 s^{1} )
12
964 Which is the last element in the series
of the actinoids? Write the electronic
configuration of this element. Comment on the possible oxidation state of this element
12
965 (i) Why do transition elements show variable oxidation states?
(ii) Name the element showing
maximum number of oxidation states
among the first series of transition metals from ( boldsymbol{S} boldsymbol{c}(boldsymbol{Z}=boldsymbol{2} mathbf{1}) ) to ( boldsymbol{Z} boldsymbol{n}(boldsymbol{Z}=boldsymbol{3} boldsymbol{0}) )
(iii) Name the element which shows
only +3 oxidation state
(iv) What is lanthanoid contraction?
Name an important alloy which contains some of the lanthanoid metals
12
966 Which of the following lanthanides have no partially filled ( 4 f ) sub-shell but have
electrons in ( 5 d ) sub-shell ?
A ( . C e )
в. ( L u )
c. ( P m )
D. ( N d )
12
967 ( C r_{2} O_{7}^{2-p H>a} C r O_{4}^{2-p H leqslant b} C r_{2} O_{7}^{2-} )
Find the value of ( frac{boldsymbol{a}}{boldsymbol{b}}: )
12
968 Number of ( C r-O ) bonds in dichromate
( operatorname{ion}left(C r_{2} O_{7}^{2-}right) ) is:
( A cdot 6 )
B. 7
( c cdot 8 )
D. 4
12
969 The extent of actinoid contraction is
greater than lanthanoid contraction
explain
12
970 Which one of the following elements forms compounds that are all coloured?
A. Magnesium
B. Aluminium
c. Iron
D. Chromium
12
971 ( G d(64) ) has unpaired
electrons with sum of spin
( mathbf{A} cdot 7,3.5 )
в. 8,3
( c .6,3 )
D. 8,4
E . 9,3.5
12
972 Least paramagnetic property is shown by:
A . ( F e )
в. ( M n )
c. ( N i )
D. ( C u )
12
973 Which of the following represents the electronic configuration of a transition
elements?
A ( cdot 1 s^{2}, 2 s^{2} p^{6} dots . . n s^{2} p^{3} )
B . ( 1 s^{2}, 2 s^{2} p^{6} ldots . . n s^{2} p^{6} d^{3},(n+1) s^{2} )
C ( cdot 1 s^{2}, 2 s^{2} p^{6} ldots n s^{2} p^{6} d^{10},(n+1) s^{2} p^{1} )
D. ( 1 s^{2}, 2 s^{2} p^{6} ldots . n s^{2} p^{6} )
12
974 In aqueous solution ( mathrm{Eu}^{2+} ) acts as :
A . an oxidsing agent
B. reducing agent
C. can act as either of these
D. can not act as either of these
12
975 What are alloys? Name an important alloy which contains some of the
lanthanoid metals. Mention its uses.
12
976 Match list-I with list -II.
List I
(A) Lanthanide contraction
( (p) d )
block
(B) Diagonal relationship Elements of 3rd period
(C) Typical elements
( (r) )
block
(D) Inner transition elements
( mathrm{Be}-mathrm{A} )
( A cdot A-r, B-s, C-q, D-r )
B. A-p,B -r,C – s, D-q
( c cdot A-s, B-q, c-p, D-r )
D. A – q, B – p, C – r, D- –
12
977 Regarding the magnetic properties of
lanthanides and actinides the correct
statement is:
A. Lanthanides are weakly paramagnetic while actinides are strongly paramagnetic
B. Quenching of orbital contribution is greater in lanthanides than in actinides
C. ( 5 f ) electrons in actinides are too diffuse and are less
effectively shielded which results in considerable quenching of orbital contribution, and hence the magnetic moments of actinides are significantly less than theoretically predicted values
D. Because of diffused f electrons there is no quenching of orbital contribution towards magnetic moment
12
978 What are inner transition elements?
Decide which of the following atomic
numbers are the atomic numbers of the
inner transition elements :
( mathbf{2 9}, mathbf{5 9}, mathbf{7 4}, mathbf{9 5}, mathbf{1 0 2}, mathbf{1 0 4} )
12
979 Question 12. A solution of KMnO4 on reduction yields either a
colourless solution or a brown precipitate or a green solution depending
on pH of the solution. What different stages of the reduction do these
represent and how are they carried out?
Qu
12
980 Consider the following statements in respect of lanthanoids.
1. The basic strength of hydroxides of
lanthanoids increases from ( mathrm{La}(O H)_{3} ) to
( boldsymbol{L} boldsymbol{u}(boldsymbol{O} boldsymbol{H})_{4} )
2. The lanthanoid ions ( boldsymbol{L} boldsymbol{u}^{3+}, boldsymbol{Y} boldsymbol{b} boldsymbol{6} boldsymbol{2}+, boldsymbol{C} boldsymbol{e}^{4+} ) are diamagnetic.
Which of the statement(s) given above is are correct?
A. Only 1
B. Only 2
c. Both 1 and 2
D. Neither 1 nor 2
12
981 The property seen in f-block elements is:
A. Lanthanide contraction
B. actinide contraction
( c . ) both ( (A) ) and ( (B) )
D. none of these
12
982 The colour of ( _{62} S m^{3+} ) is yellow. What is
the colour of ( _{66} D y^{3+} ? )
A. Colourless
B. Yellow
c. Red
D. Blue
12
983 The most basic oxide among
( M n O, M n_{2} O_{3}, M n O_{2} ) and ( M n_{2} O_{7} ) is :
( mathbf{A} cdot M n O )
в. ( M n O_{2} )
( mathrm{c} cdot M n_{2} O_{3} )
D. ( M n_{2} O_{7} )
12
984 Which of the following is easily oxidized?
A. ( N i S O_{4} )
в. ( F e S O_{4} )
( mathrm{c} cdot mathrm{Fe}_{2}left(mathrm{SO}_{4}right)_{3} )
D. ( S c C l_{3} )
12
985 The correct order of ionic radii of
( boldsymbol{Y} boldsymbol{b}^{3+}, boldsymbol{L} boldsymbol{a}^{3+}, boldsymbol{E} boldsymbol{u}^{3+} ) and ( boldsymbol{L} boldsymbol{u}^{3+} ) is:
( mathbf{A} cdot Y b^{3+}>L u^{3+}>E u^{3+}>L a^{3+} )
B. ( L u^{3+}<Y b^{3+}<E u^{3+}<L a^{3+} )
c. ( L u^{3+}<E u^{3+}<L a^{3+}<Y b^{3+} )
D. ( L a^{3+}<E u^{3+}<L u^{3+}<Y b^{3+} )
12
986 Assertion
Transition metals are efficient
catalysts.
Reason Transition metals usually contain incomplete d-orbitals and provide larger
surface area for adsorption.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Assertion is incorrect but Reason is correct
12
987 The most common oxidation state of
lanthanides is:
( A cdot+2 )
B. +3
( c cdot+4 )
D. +5
12
988 Give the electron configuration of the given metal (atom/ions)
( M n O_{2} )
A ( cdot[A r] 3 s^{2} 3 p^{1} )
B ( cdot[A r] 3 d^{1} 4 s^{2} )
c. ( [A r] 3 d^{3} )
D. None of these
12
989 The color of ( K M n O_{4} ) is due to:
A . L-> M charge transfer transition
B . ( sigma-sigma^{*} ) transition
c. M-> L charge transfer transition
D. d-d transition
12
990 (a) Complete the following equations:
(i) ( C r_{2} O_{7}^{2-}+2 O H^{-} rightarrow )
( M n O_{4}^{-}+4 H^{+}+3 e^{-} rightarrow )
(b) Account for the following:
(i) ( Z n ) is not considered as a transition
element.
(ii) Transition metals form a larger number of complexes.
(iii) The ( E^{0} ) value for the ( M n^{3+} / M n^{2+} )
couple is much more positive than that for ( boldsymbol{C r}^{3+} / boldsymbol{C r}^{2+} ) couple.
12
991 5th period element with no electrons in
5th orbit is:
A. Pd
B. Pt
c. ( mathrm{Ni} )
D. zn
12
992 Question 11. Although +3 oxidation state is the characteristic oxidation
state of lanthanoids but cerium shows +4 oxidation state also. Why?
Solution
12
993 What is spitting of silver? How can it be
prevented?
12
994 Q.52 Match the catalysts given in Column I with the processes given in
Column II.
1
A
B.
C
D.
Column 1
(Catalyst)
Ni in the presence of hydrogen
CUCI,
vos
Finely divided iron
TICIA + Al(CH),
Column II
(Process)
Ziegler-Natta catalyst
Contact process
Vegetable oil to ghee
Sandmeyer reaction
Haber’s process
Decomposition of KCIO
3.
4.
5.
6.
E
12
995 Assertion
The highest oxidation state of ( O s ) is +8
Reason Osmium is a 5 d-block element.
Read the above assertion and reason
and choose the correct option from the
following.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
c. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect
12
996 Non-Lanthanoid element is:
A . La
B . Lu
( c cdot P r )
D. Pm
12
997 The correct statement for ( d ) -block
element is:

This question has multiple correct options
A. It shows magnetic property
B. It has variable valency
C. It has tendency of formation of colored ions
D. It has complete ( d ) -orbitals

12
998 Which shells are called penultimate and prepenultimate shells? 12
999 47. Which one of the following does
not contain Silver ?
(1) Ruby Silver
(2) Lunar Caustic
(3) German Silver
(4) Horn Silver
12
1000 7. Baeyer’s reagent is
(a) alkaline permanganate solution
(b) acidified permanganate solution
(c) neutral permanganate solution
(d) aqueous bromine solution
(IIT-JE
12
1001 17. K,Cr, O, is an oxidizing agent in acidic medium. How
many O-atoms are directly linked to each Cr-atom?
12
1002 The approximate size of the nucleus of ( 64 N i ) is:
( : 88^{text {. }} ) :
( A cdot 3 ) fm
B. 4 fm
c. 5 fm
( D cdot 2 mathrm{fm} )
12
1003 Brown glass and cement have, which element common in them:
A . ( F e )
в. ( A l )
( c . N a )
D. all of these
12
1004 The colour of Lanthanoids and Actinoids
is due to:
A. s-ftransitions
B. p-f transitions
c. d-f transitions
D. f-f transitions
12
1005 How many of the following ions have the same magnetic moments?
( mathrm{Fe}^{2+} mathrm{Mn}^{2+} mathrm{Cr}^{2+} mathrm{Ni}^{2+} )
A
B. 2
( c cdot 3 )
D. 4
12
1006 Complete the given reaction. ( 2 M n^{2+}+5_{–}(i)_{–}+8 H_{2} O rightarrow 2_{–} )
( (i i)_{–}+16 H^{+} )
( (i i)_{–}+10_{–} )
A ( cdot(i)-S O_{4}^{2-},(i i)-M n O_{4}^{-},(i i i)-S_{2} O_{8}^{2-} )
B . ( (i)-S_{2} O_{8}^{2-},(i i)-M n O_{4}^{-},(i i i)-S_{2} O_{4}^{2} )
C ( cdot(i)-M n O_{4}^{-},(i i)-S_{2} O_{8}^{2-},(i i)-S O_{4}^{2} )
D ( cdot(i)-S_{2} O_{8}^{2-},(i i)-S O_{4}^{2-},(i i i)-M n O_{4} )
12
1007 Which of the following statements
regarding Lanthanides is false?
A. All lanethanides are solid at room temperature
B. Their usual oxidation state is +3
C. They can be separated from one another by ionexchange method
D. lonic radii of trivalent lanthanides steadily increases with increase in atomic number
12
1008 Show with balanced equations what happens when the following are mixed:
Aqueous solution of potassium chromate and acid.
A ( cdot 2 C r O_{4}^{2-}+2 H^{+} rightleftharpoons C r_{2} O_{7}^{2-}+H_{2} O )
B ( cdot 2 C r O_{4}^{2-}+10 H^{+} rightleftharpoons C r_{2} O_{3}^{2-}+5 H_{2} O )
( mathrm{c} cdot 2 mathrm{Cr} mathrm{O}_{4}^{2-}+6 mathrm{H}^{+} rightleftharpoons mathrm{Cr}_{2} mathrm{O}_{5}^{2-}+3 mathrm{H}_{2} mathrm{O} )
D. None of these
12
1009 Which of the following statements is
incorrect?
A. Transition elements exhibit higher enthalpies of atomization as they have stronger interatomic interaction
B. Second ionisation energy of ( _{23} V_{25} M n ) and
( _{28} N i_{30} Z n )
C ( . N i(I I) ) compounds are more stable than ( P t(I I) ) whereas ( P t(I V) ) compounds are more stable than nickel ( (I V) )
D. The elements which give the greatest number of oxidation states do not occur in or near the middle of the series
12

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