Periodic Classification Of Elements Questions

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Periodic Classification Of Elements Questions

List of periodic classification of elements Questions

Question No Questions Class
1 Largest atomic size is:
A.
в.
( c . F )
D.
10
2 Due to its semiconductor properties, the element used in computers, ( T V ), etc. is :
A. carbon
B. silicon
c. bromine
D. fluorine
10
3 Which of the following element has the
least metallic character?
A. ( C )
B. ( S ) i
c. ( G e )
D. ( S n )
10
4 ( X, Y ) and ( Z ) are three elements in the
third period.
X reacts with chlorine to give a liquid
product.
Y reacts with chlorine to give a solid
product that dissolves in water to give a
solution of ( mathrm{pH} 7 )
z reacts with chlorine to give a solid product that dissolves in water to give a
solution of ( mathrm{pH} 6 ) Which elements are good conductors of electricity?
A. ( x ) and ( Y )
B. Y and Z
c. Y only
D. Zonly
10
5 Which one is the descending order of atomic radius of elements of third
period? ( N a(z=11), M g(z=12), A l(z=13) )
and ( boldsymbol{S} boldsymbol{i}(boldsymbol{z}=mathbf{1 4}) )
A. ( S i>A l>M g>N a )
в. ( N a>M g>A l>S i )
c. ( N a<M gS i )
D. ( N a>A l>M g=S i )
10
6 Define non-metallic character.
( A . ) An atom is said to be a non-metal if it loses one or
more electrons when supplied with energy
B. An atom is said to be a non-metal if it loses only one electron when supplied with energy
C. An atom is said to be a non-metal if it gains one or more electrons when supplied with energy
D. An atom is said to be a non-metal if it gains only one electron when supplied with energy
10
7 Increasing electropositive character:
( boldsymbol{A l}<boldsymbol{M} boldsymbol{g}<boldsymbol{N} boldsymbol{a} )
If true enter 1 , else enter 0 .
( A )
10
8 The density of solid argon is 1.65 g per
( mathrm{cc} ) at ( -233^{circ} mathrm{C} ). If the argon atom is assumed to be a sphere of radius
( 1.54 times 10^{-8} mathrm{cm}, ) the percentage of
empty space in solid argon is:
A . 32%
B. 54%
c. ( 68 % )
D. 62%
10
9 Calculate the number of moles in
(i) ( 8 g ) of oxygen atoms
(ii) ( 4.088 times 10^{21} ) number of oxygen
atoms (Atomic mass of ( boldsymbol{O}=mathbf{1 6} boldsymbol{u}) )
10
10 Which element has the most metallic
character?
A. Boron
B. Aluminium
c. Indium
D. Thallium
10
11 Which of the following anions is most easily polarized?
A ( cdot C l )
B. ( S e^{2} )
c. ( B r^{-} )
D. ( T e^{2} )
10
12 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
10
13 The atom of largest size is:
A .
B. At
( c )
D. Be
10
14 Match the correct atomic radius with
the element:
( begin{array}{ll}text { Element } & text { Atomic radius }(mathrm{pm}) \ text { (a) } B e & text { (p) } 74 \ text { (b) } C & text { (q) } 88 \ text { (c) } O & text { (r) } 111 \ text { (d) } B & text { (s) } 77 \ text { (e) } N & text { (t) } 66end{array} )
10
15 Compare metallic character of
following:
( boldsymbol{S} boldsymbol{e}, boldsymbol{A} boldsymbol{s} )
10
16 The atomic radius decreases in a period
due to :
A. increase in nuclear attraction
B. decrease in nuclear attraction
c. increase in number of electrons
D. decrease in number of electrons
10
17 Which of the following has the smallest
size ?
( mathbf{A} cdot I^{-} )
B. ( S^{2-} )
( c cdot O^{2} )
D. ( C l )
10
18 Select correct statement.
A. Across a transition series (from Cr to CO), 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 and B are correct statements
D. Both ( A ) and ( B ) are incorrect statements
10
19 The diameter of zinc atom is ( 2.6 A ) Calculate (a) radius of zinc atom in pm
and (b) number of atoms present in a length of ( 1.6 mathrm{cm} ) if the zinc atoms are arranged side by side lengthwise.
10
20 Which of the following elements has the least non-metallic character?
A. Fluorine
B. Chlorine
c. Bromine
D. lodine
10
21 A very slight decrease in atomic radius
occurs in a transition series when
compared with that in a representative series. This is due to:
A. shielding effect
B. penetrating effect
c. inert pair effect
D. bonding nature
10
22 Atomic number of an element is 16 .
What is the nature of the element?
A . Alkali metal
B. Transition metal
c. Non metal
D. Halogen
10
23 How does the metallic character vary
across the period? Explain.
10
24 Justify the following with suitable reasons: Size of the atom increases as
we move down the group.
10
25 Assertion
Atom with large atomic radii and low
ionisation potential are more metallic
in nature.
Reason
Atom with large atomic radii and low
ionisation potential have tendency to
loose electron
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
10
26 The most non-metallic element among the following is:
A.
B.
( c cdot 0 )
D. c
10
27 What is the correct order of size of ( mathrm{Pd} )
( mathrm{Pt}, ) Ni?
10
28 The most electropositive element is :
A . ( C s )
в. ( C )
c. ( C l )
D. ( K )
10
29 The atomic radius of ( A g ) is closed to :
A. ( C u )
в. ( H g )
c. ( N i )
D. ( A u )
10
30 All are non-metals except:
( mathbf{A} cdot ) hydrogen ( left(H_{2}right) ) and carbon (C)
B. potassium (K)
C. inert gases (helium, neon and argon)
D. sulphur (S), phosphorus (P), and fluorine (F)
10
31 Atomic radius goes on decreasing while going from left to right in a period 10
32 Sodium [Na] and Sulphur [S] both are present in third period of modern periodic table. Which is more metallic
and why?
10
33 Among the elements ( B, M g, A l ) and ( K ) the correct order of increasing metallic
character is:
A. ( B<A l<M g<K )
в. ( B<M g<A l<K )
c. ( M g<B<A l<K )
D. ( M g<A l<B<K )
Е. ( K<M g<A l<B )
10
34 Metallic nature increases moving down the group because:
A. nuclear’charge decrease
B. shielding increases
(B) both
( c cdot(A) ) and
D. none of these
10
35 Elements with low electronegativity are usually non-metallic.
A. True
B. False
10
36 Arrange the following in increasing
order of radii:
a) ( boldsymbol{I}, boldsymbol{I}^{+}, boldsymbol{I}^{-} )
( mathbf{b}) C, N, boldsymbol{S} boldsymbol{i}, boldsymbol{P} )
10
37 The atomic size refers to:
A. diameter of an atom.
B. radius of an atom.
C. size of two atoms in a molecule.
D. none of the above.
10
38 Which of the following ( N^{3-}, O^{2-}, F^{-} ) is
largest in size?
A ( cdot N^{3} )
B. ( O^{2} )
( c cdot F^{-} )
D. All of these
10
39 Which element has highest electronegativity?
A.
в. не
c. Ne
D. Na
10
40 Identify the incorrect order in terms of
atomic radii.
( mathbf{A} cdot N^{3-}>P^{3} )
B. ( O^{2-}>F^{-} )
( mathrm{c} cdot mathrm{Ca}^{2+}>mathrm{Sr}^{2} )
D ( cdot S^{-}>S^{2-} )
E ( . S^{2-}>O^{-} )
10
41 Which of the following statement is
incorrect?
A. Non-metals are electro-positive in nature
B. Metals are electro-positive in nature
C. Metals are present on the left hand side of the periodic table
D. Non-metals are present on the right hand side of the periodic table
10
42 Fill in the blanks with the appropriate
words in each case
Element ‘Z’ in a sub-group 2[II A] is below element ‘Y’ in the same sub-
group.The element ‘Z’ will be expected to
have atomic size and metallic
character than ( y )
A. lower, more
B. lower, less
c. higher, more
D. higher, less
10
43 Which of the following elements will
have maximum metallic
characteristic?
A . Ga
B. Ge
c. As
D. se
10
44 The correct order of radii is:
( mathbf{A} cdot L i<B e<M g )
B ( cdot B e^{+2}<L i^{+}<H^{-} )
( mathbf{C} cdot M n^{3+}<M n^{2+}C l^{-}>S^{2-} )
10
45 Assertion
Atomic sizes of ( C s ) and ( F r ) are almost
similar.
Reason
Cs and Fr belong to same group.
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
10
46 Which of the following is smallest in
size?
A ( cdot O^{2} )
B. ( C^{4} )
( c cdot F^{-} )
D. ( N^{3} )
10
47 Which of the following choices both show the correct order of elements by
increasing atomic radius AND by increasing ionization energy?
A. ( A l, S, C l ) and ( A l, S, C l )
в. ( A l, S, C l ) and ( C l, S, A l )
c. ( C l, S, A l ) and ( C l, S, A l )
D. ( C l, S, A l ) and ( A l, S, C l )
10
48 On moving from left to right across a period in the table, the metallic
character:
A . increases
B. decreases
c. remains constant
D. first increases and then decreases
10
49 With the increase in size of a group:
A. metallic character decreases
B. metallic character increases
C . chemical reactivity decreases
D. chemical reactivity remains same
10
50 Which of the following group of elements has the same size?
A. ( S e, V, M n )
в. ( M n, ) Fe, Со
c. ( T i, V, C r )
D. ( L i, B e, B )
10
51 Which of the following elements will
form an acidic oxide?
A. An element with atomic number 7
B. An element with atomic number 3
C. An element with atomic number 12
D. An element with atomic number 19
10
52 43. In the periodic table of elements,
on moving from left to right
across a period, the atomic radi-
us
(1) decreases
(2) increases
(3) remains unchanged
(4) does not follow a definite pat-
tern
10
53 Which of the following has metallic as well as non-metallic character?
(i) Arsenic
(ii) Antimony (iii) Lead
( A cdot( ) i) only
B . (ii) only
c. (i) and (ii) only
D. (i), (ii) and (iii)
10
54 The radius of which ion is closet to that
of ( L i^{+} ) ion?
A ( . N a^{+} )
B. ( B e^{2} )
c. ( M g^{2+} )
D. ( A l^{3} )
10
55 Which of the following set of elements is written in order of their increasing metallic character?
A. ( B e<M g<C a )
в. ( N a<L i<K )
с. ( M g<A l< ) S ( i )
D. ( C<O<N )
N
10
56 What are metals? 10
57 Which of the following is a non-metal?
A . Ge
B. As
c. ( T ) e
D. se
10
58 Arrange the following in increasing order of their atomic radii.
( mathrm{Li}, mathrm{Be}, mathrm{Ne}, mathrm{C}, mathrm{B} )
A. ( N e<C<B<B eN e>C>B>B e )
c. ( N e>C>B>B e>L i )
D. ( L i>N e>B>C>B e )
10
59 The correct order for decreasing atomic radius of the five atoms ( boldsymbol{H}, boldsymbol{B r}, boldsymbol{I}, boldsymbol{H} boldsymbol{e} )
and ( S ) is :
A ( . I>B r>S>H e>H )
В. ( I>S>B r>H>H e )
c. ( I>S>B r>H e>H )
D. ( B r>I>S>H e>H )
10
60 Which of the following electronic configuration corresponds to the most electropositive character?
A ( cdot[H e] 2 s^{1} )
B . ( [H e] 2 s^{2} )
( c cdot[X e] 6 s^{1} )
D. ( [X e] 6 s^{2} )
10
61 Which of the following statements is
true?
A. Cations are smaller in size than neutral atoms.
B. Horizontal rows in the table are called periods.
C. On going across the periods atomic size of the element decreases.
D. All to the above
10
62 The covalent and Van der walls radii of
chlorine respectively are:
( mathbf{A} cdot 1.80 A^{circ} & 0.99 A^{circ} )
B. ( 0.99 A^{circ} ) & ( 1.80 A^{circ} )
( mathbf{C} cdot 1.80 A^{circ} & 1.80 A^{circ} )
D. ( 0.99 A^{circ} ) & ( 0.99 A^{circ} )
10
63 The most metallic element among the following is :
A. ( P )
в. ( A s )
( c . B i )
D. ( S b )
10
64 Fill in the blanks by selecting the correct word from the brackets:
(i) If an element has a low ionization
energy then it is likely to be (metallic / non metallic).
(ii) If an element has seven electrons in
its outermost shell then it is likely to have the ( _{–}-_{–}- ) (largest / smallest) atomic size among all the elements in
the same period.
10
65 Amongst the elements ( mathrm{B} ), Al, ( mathrm{C} ) and ( mathrm{Si} ),
the element having most metallic character is:
( A cdot A )
B.
( c . ) в
D. si
10
66 Considering the element ( B, A l, M g ) and
( K, ) write the correct order of their
metallic character.
10
67 The order not in accordance with the
property mentioned is ?
( mathbf{A} cdot L i<N a<KN>O>C ) – ionisation enthalpy
c. ( S i<P<S<C l ) – electronegativity
D. ( F<C l<B r<I ) – electronegativity
10
68 Consider the following statements and arrange in the order of true/ false as
given in the codes.
( boldsymbol{S}_{1}: ) Metals comprises less than ( 78 % ) of
all known elements and appear on the
left side of the periodic table.
( S_{2}: ) Silicon, germanium, arsenic, antimony, selenium and tellurium all are semi-metals.
( boldsymbol{S}_{3}: ) The following order represents the correct increasing order of metallic character; ( boldsymbol{P}<boldsymbol{S} boldsymbol{i}<boldsymbol{B} boldsymbol{e}<boldsymbol{M} boldsymbol{g}<boldsymbol{N} boldsymbol{a} )
A. FFT
в. ( pi )
c. FTF
D. TT
10
69 The atomic radius of hydrogen atom is:
( A cdot 25 mathrm{pm} )
B. 30 pm
c. ( 53 mathrm{pm} )
D. ( 43 mathrm{pm} )
10
70 Name the element that first shows
some visible metallic properties at
room temperature
A. Fluroine
B. Chlorine
c. Bromine
D. lodine
E. Astatine
10
71 Define atomic size. Give its unit of
measurement. In the modern periodic table what trend is observed in the
atomic radius in a group and a period and why is it so?
10
72 Atomic radius is measured by:
A. Rutherfords ( alpha ) -ray scattering experiment
B. X-ray diffraction technique
C. Millikan’s oil drop method
D. Thomsons water-melon model
10
73 Which of the following is an intensive
property?
A. Temperature
B. Viscosity
c. Surface tension
D. All of these
10
74 Assertion
Atomic size decreases across period
but increases down a group of the
periodic table.
Reason
Moving from left to right across a period, electrons are added one at a
time to the outer energy shell. Electrons within a shell cannot shield each other
from the attraction to protons, while
moving down a group in the periodic
table, the number of electrons and filled
electron shells increases.
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
10
75 Metallic character goes on decreasing while going from left to right in a period.
A. True
B. False
10
76 Metals can produce sound when struck, this property of metals is known as sonority.
A. True
B. False
10
77 The order of size is:
A. ( S^{2-}>C l^{-}>O^{2-}>F^{-} )
B. ( C l^{-}>S^{2-}>O^{2-}>F^{-} )
c. ( S^{2-}>O^{2-}>C l^{-}>F^{-} )
D. ( S^{2-}>O^{2-}>F^{-}>C l^{-} )
10
78 Which of the following has the smallest
size ?
( mathbf{A} cdot I^{-} )
B. ( S^{-2} )
c. ( O^{-2} )
D. ( C l )
10
79 The correct order for decreasing atomic radius of the five atoms ( mathrm{H}, mathrm{Br}, mathrm{I}, mathrm{He} ) and
Sis?
( A cdot mid>B r>S>H e>H )
( mathbf{B} cdot mid>S>B r>H>H e )
( mathrm{c} cdot mid>mathrm{S}>mathrm{Br}>mathrm{He}>mathrm{H} )
( mathbf{D} cdot mathbf{B r}>mid>mathbf{S}>mathrm{He}>mathbf{H} )
10
80 On passing ( 0.5 mathrm{F} ) of electricity through molten sodium chloride, sodium deposited at cathode will be
A . ( 29.25 g )
в. ( 11.50 g )
c. ( 58.50 g )
D. ( 0.00 g )
10
81 Increasing order of metallic characteristic of ( mathrm{C}, mathrm{Sb}, mathrm{As}, mathrm{Bi}, ) Si is
shown by :
A. ( c, ) si, ( A s, ) sb, Bi
B. ( C, ) Si, Bi, Sb, As
c. ( c, ) si ( , ) sb, Bi, As
D. ( c, ) si, As, Bi, Sb
10
82 The correct order of decreasing metallic
character is:
( mathbf{A} cdot C l>S i>A l>M g>N a )
В ( . N a>M g>A l>S i>C l )
( mathbf{c} . N a>A l>M g>C l>S i )
D. ( A l>N a>S i>C l>M g )
10
83 Four elements ( A, B, C ) and ( D ) have atomic
numbers 12,13,14 and 15 respectively
Which of them will have largest atomic
radii?
10
84 Which of the following electronic configuration represents a highly electropositive element?
A ( cdot[H e] 2 s )
B ( cdot[X e] 6 s^{1} )
( mathbf{C} cdot[H e] 2 s^{2} )
D ( cdot[X e] 2 s^{2} )
10
85 The atomic radii of the elements across
the second period of ihe periodic table:
A. decrease due to increase inatomic number
B. decrease due to increase in effective nuclear charge
C. decrease due to increase in atomic weights
D. increase due to increase in the effective nuclear
charge
10
86 Which of the following is the correct order of relative sizes?
( mathbf{A} cdot I^{-}>I^{+}>I )
B . ( I^{-}>I>I^{+} )
C ( cdot I>I^{+}>I^{-} )
D. ( I^{+}>I^{-}>I )
10
87 Which of the following element has the smallest atomic radius?
( mathbf{A} cdot K )
в. ( C a )
( c . B r )
D. ( K r )
E. ( Z n )
10
88 Among the following metals which one has the least metallic character?
( A cdot B e )
в. ( M g )
( c . C a )
D. ( S r )
10
89 In the periodic table, the metallic
character of element:
A. decreases from left to right across a period and on descending a group
B. decreases from left to right across a period and increases on descending a group
C. increases from left to tight across a period and on descending a group
D. increases from left to right across a period and decreases on descending a group
10
90 Out of ( boldsymbol{F} boldsymbol{e}^{2+}, boldsymbol{F} boldsymbol{e}^{3+}, boldsymbol{M} boldsymbol{n}^{2+} ) and ( boldsymbol{T} boldsymbol{i}^{2+}, ) the
least size is of:
( mathbf{A} cdot M n^{2+} )
B. ( T i^{2} )
( mathrm{c} cdot F e^{2} )
D. ( F e^{3} )
10
91 Which of the following element is most electropositive?
( mathbf{A} cdot H )
в. ( M g )
( c . C a )
D. ( S ) i
10
92 Assertion
Atomic size decreases in a period due
to increase of atomic number.
Reason
The nuclear charge is increasing and size of valence shell remains same as
we move from left to right. Hence, in any
period, the atomic size of the element decreases from left to right.
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
10
93 Element ‘X’ in period 3 has high electron affinity and electronegativity. It is likely to be a
A . alkali metal
B. alkaline metal
c. transition metal
D. non-metal
10
94 An element has cubic close packed
structure. The distance between
adjacent layers is 424.2 pm. What
would be the atomic radius of the
element?
A. ( 259.8 mathrm{pm} )
В. ( 346.4 mathrm{pm} )
c. ( 529.8 mathrm{pm} )
D. ( 644.3 mathrm{pm} )
10
95 Which of the following orders are
Correct?
A. ( A g C l>A g F: ) Covalent character order
B ( cdot B a O>B a F_{2}: ) Melting point order
( mathbf{C} cdot B e F_{2}>B a F_{2}: ) Solubility order
D. ( L i N O_{3}<R b N O_{3}: ) Thermal stability order
10
96 ( K^{+} ) and ( F^{-} ) have identical radius about
1. 34 A. What should be the atomic
radius of ( K ) and ( F ) atoms?
10
97 The correct order according to size is
A ( cdot O>O^{-}>O^{2-} )
В. ( O^{-}>O^{2-}>O )
c. ( O^{2-}>O^{-}>O )
D. ( O>O^{2-}>O^{-} )
10
98 Out of ( mathrm{H}, mathrm{C} ) and ( mathrm{F} ) which has largest
atomic size?
10
99 Among the elements of the second period pick out the element which has a smallest atomic radius.
A. ( F )
в. ( L ) i
( c . c )
D. Ne
10
100 Non-metallic character
down the group.
A. increases
B. decreases
c. constant
D. none of these
10
101 Nuclear charge with
decrease in atomic number.
A. increases
B. decreases
c. remains same
D. increases then decreases
10
102 Most metallic element in the fifth
period is?
A . silver
B. rubidium
c. gold
D. rhodium
10
103 Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the brackets are atomic
numbers)
A ( . quad Z r(40) ) and ( N b(41) )
B. ( Z r(40) ) and ( H f(72) )
c. ( Z r(40) ) and ( T a(73) )
D. ( T i(22) ) and ( Z r(40) )
10
104 Which of the following is more nonmetallic element from the elements ‘X’
and ‘Y’ having electronic configurations 2,8,5 and 2,8,6 respectively?
A. ( x )
B. Y
c. Both have same non-metallic character
D. None of the above
10
105 Which of the following has the largest size?
( mathbf{A} cdot R b^{-} )
В. ( M g^{+2} )
( mathbf{c} cdot L i^{+} )
D. ( B a^{+2} )
10
106 Among
( (a) N a_{2} O )
( (b) M g O,(c) A l_{2} O_{3} )
( (d) P_{2} O_{5} )
the most basic, most acidic and amphoteric oxide can be respectively:
( A cdot a, b, c )
B. b, e, c
( c cdot a, e, c )
( D cdot e, c, a )
10
107 With an increase in atomic number in a
period :
A. metallic character decreases
B. metallic character increases
c. chemical reactivity decreases
D. chemical reactivity increases
10
108 The radius of potassium atom is 0.203 nm. The radius of the potassium ion in nano-meter will be:
( mathbf{A} cdot 0.133 )
B. 0.231
c. 0.234
D. 0.251
10
109 Which of the following sequence of
explanation is appropriate for explaining the reason for the periodicity of reducing property in a period or
group?
(a) Tendency to undergo oxidation decreases in a period and increases in a
group.
(b) In a period ionization energy increases and in a group it decreases.
(c) In a period the atomic size
decreases and in a group it increases.
(d) The elements present in the left side of the periodic table have strong reducing property.
( A cdot cos a )
B. c d b a
( c cdot d c a b )
D. ( d ) b a c
10
110 For what type of ions the ionic radius is less than the atomic radius? 10
111 The ( C-C ) and ( S i-C ) inter-atomic
distance are ( 154 p m ) and ( 188 p m ). the
atomic radius of ( boldsymbol{S} boldsymbol{i} ) is:
( mathbf{A} cdot 77 p m )
B . 94 pm
( c .114 p m )
D. ( 111 p m )
10
112 Carbon: non-metal:: Germanium:
A . Metal
B. Non-metal
c. Metalloid
D. Liquid non-metal
10
113 Define Atomic radii, covelentradii
metallic radii?
10
114 Which one of the following is smallest in size ?
A . ( N^{-3} )
B. ( O^{-2} )
( c cdot F^{-} )
D. ( N a^{text {t }} )
10
115 Which one is the base: ( C s O H ) or ( H B r ) ?
A. ( C s O H )
в. НВт
c. Both ( A ) and ( B )
D. None of the above
10
116 Which of the following statements is incorrect?
A. Generally the radius trend and the ionization energy trend across a period are opposites.
B. Metallic and covalent radii of potassium are ( 2.3 A^{circ} ) and
( 2.03 A^{circ} ) respectively.
C. Amongst ( L i^{-}, B e^{-}, B^{-} ) and ( C^{-}, L i^{-} ) is least stable ion.
D. Atomic and ionic radii of Niobium and Tantalum are
almost same.
10
117 The correct order of the atomic radii of
( mathrm{C}, mathrm{Cs}, mathrm{Al} ) and ( mathrm{S} ) is :
( A cdot S<C<A mid<C S )
B. ( s<c<c s<A l )
( c cdot c<s<c s<A )
D. ( c<S<A mid<C ) s
10
118 Atomic radii of Flourine and Neon in
Angstorm units are given by?
A. 0.72,1.60
в. 1.60,1.60
c. 0.72,0.72
D. None of these
10
119 Atomic radius of which element has the
least value in ( 2^{n d} ) period?
A. Hydrogen
B. Florine
c. Neon
D. Helium
10
120 Among the following pairs, the one containing examples of metalloid elements in the periodic table is:
( mathbf{A} cdot N a ) and ( K )
B. ( F ) and ( C l )
c. ( C u ) and ( A g )
D. ( B ) and ( S i )
10
121 The ground state electronic configurations of the elements, U, ( mathrm{V}, mathrm{W} ) ( x ) and ( Y ) (these symbols do not have any
chemical significance) are as follows:
U ( 1 s^{2} 2 s^{2} 2 p^{3} )
( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1} )
W ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{2} )
( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{2} )
( Y 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{6} )
Determine which sequence of elements
satisfy the following statements:
(i) Element forms a carbonate which is
not decomposed by heating
(ii) Element is most likely to form coloured ionic compounds
(iii) Element has largest atomic radius
(iv) Element forms only acidic oxide
A. vw y u
в. ( vee times Y ) w
c. ( v ) w ( Y x )
D. ( v times w u )
10
122 Within a group of the periodic table as one goes from downward to upward, the metallic character:
A . decreases
B. increases
c. first increases then decreases
D. does not change
10
123 Which one of the following oxides is neutral?
A . ( c o )
B. ( operatorname{sn} O_{2} )
( c cdot z n 0 )
( D cdot sin _{2} )
10

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