The P-block Elements Questions

We provide the p-block elements practice exercises, instructions, and a learning material that allows learners to study outside of the classroom. We focus on the p-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 p-block elements Questions

Question No Questions Class
1 Fluorine is highly reactive because:
A. F-F bond energy is high
B. F-F bond energy is low
C. it is gaseous at room temperature
D. Fhas a smaller size
12
2 True or False
The phenomenon of existence of an element in more than one physical form is called allotropy.
A. True
B. False
12
3 One mole of magnesium nitride on reaction with an excess of water gives:
A. one mole of ammonia
B. one mole of nitric acid
c. two moles of ammonia
D. two moles of nitric acid
12
4 Which of the following statements is
not correct for ( boldsymbol{S O}_{2} ) gas?
A. It acts as bleaching agent in moist conditions.
B. Its dilute solution is used as disinfectant.
C. Its molecules have linear geometry.
D. Acidified ( K M n O_{4} ) is decolourised when ( S O_{2} ) is passed through it
12
5 (a) Draw the structures of the following
molecules:
(i) ( boldsymbol{X} boldsymbol{e} boldsymbol{O} boldsymbol{F}_{boldsymbol{4}} )
(ii) ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} )
(b) Write the structural difference
between white phosphorus and red
phosphorus.
12
6 Which of the following is a red liquid?
A. ( S F_{4} )
в. ( S F_{6} )
c. ( S C l_{2} )
D. ( S_{2} C l_{2} )
12
7 Which one of the following ionic species has the greatest proton affinity to form the stable compound?
( mathbf{A} cdot I^{-} )
в. ( H S^{-} )
( mathbf{c} cdot N H_{2}^{-} )
D. ( F^{-} )
12
8 Borax is actually made of two tetrahera
and two triangular units joined together
and should be written as:
[
N a_{2}left[B_{4} O_{5}(O H)_{4}right] .8 H_{2} O
]
Consider the following statements about borax.
This question has multiple correct options
A. Each boron atom has four ( B-O ) bonds
B. Each boron atom has three ( B-O ) bonds
C. Two boron atoms have four ( B-O ) bonds while other
two have three ( B-O ) bonds
D. Each boron atom has one ( -O H ) groups
11
9 On reaction with unsaturated
hydrocarbons, Type ( boldsymbol{X} boldsymbol{Y} ) interhalogen compounds gives:
A. displacement reaction
B. addition reaction
c. substitution reaction
D. none of these
12
10 The compound which does not possess a peroxide linkage is:
A. ( N a_{2} O_{2} )
в. ( C r O_{5} )
( mathrm{c} cdot mathrm{H}_{2} mathrm{SO}_{5} )
D. ( P b O_{2} )
12
11 Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other?
A. is soluble in water
B. is used as a food-preservative.
c. forms ‘acid-rain’.
D. is a reducing agent
12
12 When ozone reacts with unsaturated
hydrocarbons, the products formed are called:
A . ozonites
B. ozonides
c. carbazone
D. unsaturated ozone
12
13 Bone ash mainly contains:
A. ( mathrm{CaO} )
в. ( mathrm{Ca}_{3}left(mathrm{PO}_{4}right)_{2} )
( mathrm{c} cdot mathrm{CaCl}_{2} )
D. ( mathrm{NH}_{2} mathrm{NH}_{2} )
12
14 How is Chlorine prepared by electrolyt method? Explain its reaction with:
(a) excess ( N H_{3} )
(b) cold and dil. NaOH
(c) slaked lime
12
15 Diaspore, germanite and gallite have:
A. boron
B. aluminium
c. gallium
D. indium
11
16 The inert gas atom in which the total number of d-electrons is equal to the
difference in numbers of total ( p- ) and
( s ) -electrons, is:
A. ( H e )
в. ( N e )
( c . A r )
D. ( K r )
12
17 When copper is treated with a certain
concentration of nitric acid, nitric oxide
and nitrogen dioxide are liberated in equal volumes according to the equation:
( boldsymbol{x} boldsymbol{C u}+boldsymbol{y} boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3} longrightarrow boldsymbol{C u}left(boldsymbol{N} boldsymbol{O}_{3}right)_{2}+ )
( N O+N O_{2}+H_{2} O )
The coefficients of ( x ) and ( y ) are
respectively:
( A cdot 2 ) and 3
B. 2 and 6
c. 1 and 3
D. 3 and 8
12
18 Nitric acid undergoes self dissociation.
A. True
B. False
12
19 Question 37. Which one of the following does not exist?
(i) XeOF4
(i) NeF2
(iii) XeF2
(iv) XeF.
12
20 Ammonia is dried over:
A. Quick lime
B. Slaked lime
c. Phosphorus pentoxide
D. con. H ( _{2} mathrm{SO}_{4} )
12
21 Which of the following statements
about anhydrous aluminium chloride is
correct?
A. It fumes in moist air.
B. It exists as dimer both in the vapour state below ( 350^{circ} mathrm{C} )
and in non-polar solvents.
C. It is prepared by heating ( A l_{2} O_{3} ) in a stream of sulphur
chloride ( left(S_{2} C l_{2}right) ) vapour and chlorine.
D. All of these.
11
22 Which is called stranger gas?
A. ( K r )
в. ( X e )
( mathrm{c} . ) Не
D. Ne
12
23 Match the reactions of metals with
dilute ( H N O_{3} ) (in column-I) with the
nitrogen compounds (obtained by oxidation/reduction (in column-II).
12
24 Which of the following compounds are formed by the reaction of ammonia with
acids?
This question has multiple correct options
A. Calcium ammonium nitrate
B. Ammonium chloride
c. Ammonium phosphate
D. Ammonium sulphate
12
25 Consider the following transformations
( boldsymbol{I} cdot boldsymbol{X} boldsymbol{e} boldsymbol{F}_{6}+boldsymbol{N} boldsymbol{a} boldsymbol{F} longrightarrow boldsymbol{N} boldsymbol{a}^{+}left[boldsymbol{X} boldsymbol{e} boldsymbol{F}_{7}right]^{-} )
( boldsymbol{I} boldsymbol{I} cdot boldsymbol{2} boldsymbol{P} boldsymbol{C l}_{5}(boldsymbol{s}) longrightarrowleft[boldsymbol{P} boldsymbol{C l}_{4}right]^{+}left[boldsymbol{P} boldsymbol{C l}_{6}right]^{-} )
( boldsymbol{I I I} cdotleft[A lleft(H_{2} Oright)_{6}right]^{3+}+H_{2} O longrightarrow )
( left[A lleft(H_{2} Oright)_{5} O Hright]^{2+}+H_{3} O^{+} )
Possible transformations are:
A. ( I, I I, I I I )
В. ( I, I I I )
c. ( I, I I )
D. II, III
12
26 Which of the following has seven
valence electrons?
A ( . N a^{+} )
в. ( A l )
( c . F )
D. ( T i )
E. ( B )
12
27 Which of the following substance is stored under water:
A. White phosphorus
B. red phosphorus
c. Sodium metal
D. Both white phosphorous and red phosphorus
12
28 Assertion
( A l(O H)_{3} ) is amphoteric in nature.
Reason
It cannot be used as an antacid.
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
29 The molecular formula of ammonia is
( N H_{3} . ) Therefore, the number of
hydrogen atoms in 34 g of ammonia will
be:
A. ( 3 times 6.023 times 10^{23} )
В. ( 6.023 times 10^{23} )
c. ( 34 times 6.023 times 10^{23} )
D. ( 6 times 6.023 times 10^{23} )
12
30 Formula of microcosmic salt is:
A. ( N a_{2} H P O_{4} )
в. ( operatorname{Na}left(N H_{4}right) H P O_{4} )
( mathbf{c} cdot K_{2} H P O_{4} )
D. ( N a_{2} P O_{4} . K_{2} P O_{4} )
12
31 ( [boldsymbol{X}]+boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} rightarrow[boldsymbol{Y}] ) a colourless gas
with irritating burning smell of sulphur
( [boldsymbol{Y}]+boldsymbol{K}_{2} boldsymbol{C r}_{2} boldsymbol{O}_{7}+boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} rightarrow operatorname{green} )
solution.
( [boldsymbol{X}] ) and ( [boldsymbol{Y}] ) are:
( mathbf{A} cdot S O_{3}^{2-}, S O_{2} )
в. ( C l^{-}, H C l )
( mathbf{c} cdot S^{2-}, H_{2} S )
D. ( C O_{3}^{2-}, C O_{2} )
12
32 a) Write the chemical equation to prepare sulphur dioxide from industrial
method?
b) What happens when ( S O_{2} ) is pass
through water?
c) Write reaction showing reducing property of sulphur dioxide?
d) Draw a labeled diagram showing ring structure of rhombic sulphur?
12
33 Which can do glass etching?
( mathbf{A} cdot H I O_{4} )
B. ( operatorname{SiF}_{4} )
c. ( H F )
D. ( H N O_{3} )
12
34 Oxygen is more electronegative than
sulphur, yet ( H_{2} S ) is acidic while ( H_{2} O ) in
neutral. This is because
A. water is a highly associated compound
B. ( H-S ) bond is weaker than ( H-O ) bond
c. ( H_{2} S ) is a gas while ( H_{2} O ) is a liqiud
D. the molecular weight of ( H_{2} S ) is more than that of ( H_{2} O )
12
35 ( boldsymbol{C a} boldsymbol{C O}_{3}+boldsymbol{S i O}_{2} rightarrow )
A ( cdot C a O+operatorname{Si} C O_{3} )
в. ( mathrm{CaSiO}_{3}+mathrm{SiO}_{2} )
c. ( C a S i O_{3}+C a O )
D. ( mathrm{CaSiO}_{3}+mathrm{CO}_{2} )
11
36 The element with highest boiling point in the following is :
A. oxygen
B. Sulphur
c. Tellurium
D. Polonium
12
37 In the isolation of fluorine a number of
difficulties were encountered.Which
statements are incorrect:
This question has multiple correct options
A. Fluorine reacts with moist glass vessels
B. Fluorine has great affinity for hydrogen
C. Electrolysis of aqueous HF gives ozonized oxygen
D. The potential required for the discharge of the fluoride ions lowest
12
38 Nitrogen does not show pentacovalency because of:
A. absence of s-orbitals
B. absence of d-orbitals
c. its small size
D. none of these
12
39 The hydrolysis of ( N C l_{3} ) by water molecules produces:
A. ( N H_{2} O H+H O C l )
B. ( N H_{2} N H_{2}+H O )
c. ( N H_{4} O H+H O C l )
D. ( N H_{2} C l+H O C l )
12
40 Assertion
Molecular nitrogen is less reactive than
molecular oxygen.
Reason
The bond length of ( N_{2} ) is shorter than
that of oxygen.
A. If both assertion and reason are true and the reason is a correct explanation of the assertion
B. If both assertion and reason are true but reason is not a correct explanation of the assertion
c. If the assertion is true but reason is false
D. If both the assertion and reason are false
12
41 Which of the following is an anhydride
of ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ? )
A ( . H_{2} S )
в. ( H_{2} S_{2} )
( c cdot S O_{2} )
( mathrm{D} cdot mathrm{SO}_{3} )
12
42 The M.P. and B.P. are very low for?
A. Ne
в. не
c. ( mathrm{kr} )
D. A
12
43 With excess of ( C l_{2}, ) ammonia forms:
A. ammonium chloride
B. nitrogen trichloride
c. nitrosyl chloride
D. nitrogen
12
44 Write the chemical reaction showing the bleaching action of chlorine. 12
45 Among
( boldsymbol{P b S}, boldsymbol{C u S}, boldsymbol{H} boldsymbol{g} boldsymbol{S}, boldsymbol{M n S}, boldsymbol{A} boldsymbol{g}_{2} boldsymbol{S}, boldsymbol{N i S} )
and ( operatorname{Sn} S_{2}, ) the total number of black
coloured sulphides are:
( A cdot 6 )
B. 7
( c cdot 8 )
D.
12
46 Sulphur dioxide gas turns acidified potassium dichromate paper
A . red
B. green
c. white
D. yellow
12
47 Write down the reaction when Ammonia
reacts with atmospheric oxygen in the presence of catalyst.
12
48 For the molecule ( boldsymbol{I} boldsymbol{F}_{7} )
(i) State the hybridisation of the central
atom.
(ii) State the geometry of the molecule.
12
49 White phosphorus on reaction with
NaOH gives ( P H_{3} ) as one of the products. This is a :
A. dimerization reaction
B. disproportionation reaction
c. condensation reaction
D. precipitation
12
50 Identity the true statement regarding nitrates of all metals.
A ( cdot ) All nitrates decompose to give ( N O_{2} )
B. All nitrates are soluble in water.
C. All nitrates are insoluble in water
D. All nitrates are stable to heatt
12
51 Nitrate ion on reacting with conc.
( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) gives:
A. nitrogen dioxide
B. nitrogen pentaoxide
( c . ) nitrous oxide
D. None of the above
12
52 The bleaching agent in paper and textile industry:
A . ( mathrm{NH}_{3} )
в. ( mathrm{H}_{2} mathrm{O}_{2} )
( c cdot mathrm{sO}_{3} )
D. ( mathrm{Cl}_{2} )
12
53 Sodium hexametaphosphate is known
as:
A. Calgon
B. Permutit
c. Natalite
D. Nitrolim
12
54 Which of the following statements is
(are) correct?
This question has multiple correct options
A. graphite is much less dense than diamond
B. graphite is black and soft
C . graphite has low melting point
D. graphite feels smooth and slippery
11
55 Phosphine is a reducing agent
If true enter 1 , else enter 0 .
12
56 When less amounts of oxygen is present, carbon combines with it to give
gas.
A. carbon dioxide
B. carbon monoxide
c. carbonate
D. none of these
11
57 Graphite is used for making electrodes and articles like writing pencils. It is made by heating coke with some silica for many hours in:
A. a blast furnace
B. a high electric furnace
c. the presence of air
D. a blast of steam under pressure
11
58 Which element out of He, Ar, Kr and Xe forms least number of compounds?
( mathbf{A} cdot mathbf{K} )
B. xe
c. Ar
D. не
12
59 In aqueous solution, ( left[boldsymbol{C o}left(boldsymbol{H}_{2} boldsymbol{O}right)_{6}right]^{2+}(boldsymbol{X}) )
reacts with molecular oxygen in the
presence of excess liquor ( N H_{3} ) to give
a new complex ( Y ). The number of
unpaired electrons in ( X ) and ( Y ) are,
respectively.
A . 3,1
в. 3,0
c. 3,3
D. 7,0
12
60 ( boldsymbol{H}_{3} boldsymbol{B} boldsymbol{O}_{3} stackrel{boldsymbol{T}_{1}}{longrightarrow} boldsymbol{X} stackrel{boldsymbol{T}_{2}}{longrightarrow} boldsymbol{Y} stackrel{r e d h o t}{longrightarrow} boldsymbol{B}_{2} boldsymbol{O}_{3} )
( T_{1}<T_{2} ) then ( X ) and ( Y ) respectively are :
A. ( x= ) Metaboric acid and ( Y= ) Tetraboric acid
B. X=Tetraboric acid and Y= Metaboric acid
c. ( x= ) Borax and ( Y= ) Metaboric acid
D. x=Tetraboric acid and Y= Borax
11
61 Find number of ( p pi-d pi ) bonds in
(a) Disulphate
(b) triphosphate
trimetaphosphate
(d) trimer of ( S O_{3} )
( (e) P_{4} O_{10} )
( (f) P_{4} O_{6} )
12
62 The number of hydrogen atoms attached to phosphorus atom in hypophosphorous acid is :
A. zero
B. two
c. one
D. three
12
63 In which of the following reactions, the oxidation state of nitrogen is not changed?
A . Action of very dilute ( H N O_{3} ) on magnesium.
B. Action of dilute ( H N O_{3} ) on zinc.
c. Action of conc. ( H N O_{3} ) on copper.
D. Action of very dilute ( H N O_{3} ) on zinc.
12
64 In ( N O_{3}^{-} ) ion, the number of bond pair and lone pair of electrons on nitrogen atom is/are:
A .2,2
B. 3,
( c cdot 1,3 )
D. 4,0
12
65 These questions consist of two
statements each, printed as assertion
and reason. While answering these questions you are required to choose anyone of the following five responses.
Assertion: Molecular nitrogen is less
reactive than molecular oxygen.
Reason: The bond length of ( N_{2}, ) is
shorter than that of oxygen.
A. If both assertion and reason are true and the reason is a correct explanation of the assertion
B. If both assertion and reason are true but reason is not correct explanation of the assertion
c. If the assertion is true but reason is false
D. If both the assertion and reason are false
E. If the assertion is false but the reason is true
12
66 State your observation when Conc. nitric acid is heated in absence of copper gives:
A . yellow
B. brown
c. grey
D. black
12
67 (i) Why are interhalogen compounds more reactive than halogens?
(ii) All the five bonds in ( P C l_{5} ) are not
equivalent. Justify.
12
68 During the manufacture of Chlorine by the electrolysis of brine, the by-products
are :
This question has multiple correct options
( mathbf{A} cdot mathbf{H}_{2} )
B. NaOH
c. ( N a C l+mathrm{H}_{2} )
D. NaCl
12
69 Which one of the following reacts with
conc. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ? )
A . Au
B. Agg
( c cdot P t )
D. All
12
70 Which oxide is insoluble in aqueous
sodium hydroxide?
A . Mgo
в. ( A l_{2} O_{3} )
( mathrm{c} cdot P_{4} O_{10} )
( mathrm{D} cdot mathrm{SO}_{2} )
12
71 Which element has the highest valency with respect to oxygen?
A. Sodium
B. Aluminium
c. chlorine
D. Sulphur
11
72 Which selection is the correct formula
for the chlorate ion?
A ( cdot C l^{-} )
B. ( C l O^{-} )
( mathrm{c} cdot mathrm{ClO}_{2}^{-} )
D. ( C l O_{3}^{-} )
E ( cdot C l O_{4}^{-} )
12
73 The number of Oxygen atoms bonded to each
silicon atom in silica crystal is :
A
B. 2
( c cdot 3 )
( D )
11
74 Which factor is most responsible for the increase in boiling points of noble gases from He to ( X e ? )
A . Decrease in ( I . E )
B. Monoatomic nature
c. Decrease in polarisability
D. Increase in polarisability
12
75 Incorrect statement about Ge is:
( mathbf{A} cdot G e O_{2} ) is weakly acidic
B. ( G e(O H)_{2} ) is amphoteric
C ( cdot G e C l_{2} ) is more stable than ( G e C l_{4} )
D. ( G e-G e ) bond energy is lesser than that of ( S i-S i )
11
76 Structure of ( N_{2} O ) is similar to that of
( boldsymbol{C O}_{2} )
A. True
B. False
12
77 ( C S_{2} ) burns in excess air to produce :
A. ( C O_{2} & S O_{2} )
в. ( C O_{2} & S O_{3} )
c. ( cos S O_{2} )
D. ( operatorname{co~} & mathrm{SO}_{3} )
12
78 When excess of ammonia is used:
( mathbf{3} C l_{2}+mathbf{8} N H_{3} longrightarrow A+B )
When excess of chlorine is used:
( mathbf{3} C l_{2}+mathbf{4} N H_{3} longrightarrow C+D )
The oxidation state of nitrogen in
compound ( boldsymbol{A} ) is:
A. -3
B. +3
( c .+5 )
D.
12
79 The product formed in the reaction of
( mathrm{SOCl}_{2} ) with white phosphorus is:
A ( cdot P C l_{3} )
в. ( S O_{2} C l_{2} )
( c cdot S C l_{2} )
D. ( P O C l_{3} )
12
80 ( mathrm{XeF}_{2} ) has ( _{-}-ldots_{-} ) geometry
A. linear
B. tetrahedral
c. coplanar
D. octahedral
12
81 Match the species in in ( C ) olumn ( I ) with
their corresponding properties in Column II
12
82 What happens when white phosphorus is heated with caustic soda?
Which of the following are possible
products?
This question has multiple correct options
( mathbf{A} cdot mathbf{P H}_{3} )
В. РН ( _{5} )
( mathrm{c} cdot mathrm{NaH}_{2} mathrm{PO}_{2} )
D. ( mathrm{NaH}_{4} mathrm{PO}_{2} )
12
83 Which of the following has 0-0 linkage:
A ( cdot mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{6} )
в. ( mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{8} )
( mathrm{c} cdot mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{3} )
D. ( mathrm{H}_{2} mathrm{S}_{4} mathrm{O}_{6} )
12
84 In the Contact process, sulphur trioxide is not converted to sulphuric acid by
reacting it with water. Instead a twostep procedure is used. The equations for the two steps involved are:
( boldsymbol{S} boldsymbol{O}_{boldsymbol{x}}+boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} rightarrow boldsymbol{H}_{2} boldsymbol{S}_{2} boldsymbol{O}_{boldsymbol{y}} )
( boldsymbol{H}_{2} boldsymbol{S}_{2} boldsymbol{O}_{7}+boldsymbol{H}_{2} boldsymbol{O} rightarrow boldsymbol{2} boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} )
Find the value of ( x ) and ( y: )
A. ( x=2, y=5 )
в. ( x=3, y=5 )
c. ( x=2, y=7 )
D. ( x=3, y=7 )
12
85 Which gas cannot collected over water?
A. ( O_{2} )
в. ( P H_{3} )
c. ( N_{2} )
D. ( S O_{2} )
12
86 The structure formula of
hypophosphorous acid is:
( A )
в.
( c )
D.
12
87 An atom has ( 2 K, 8 L ) and ( 5 M ) electrons.
Choose the correct statement(s)
regarding it.
A. Trivalent anion of this atom will have
12 protons in its nucleus.
B. Trivalent cation of this atom will have
six p-electrons in it.
C. This atom form an amphoteric oxide
of formula ( X_{2} O_{3} )
D. One of its allotrope is tetra atomic
( left(X_{4}right) )
A. ( A ) and ( B )
B. ( B ) only
c. ( B ) and ( C )
D. ( B ) and ( D )
12
88 Why is ( N_{2} ) less reactive at room
temperature?
12
89 Concentrated ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) cannot be used to
prepare HBr or HI from KBr or KI because
it
A. reacts too slowly with KBr or KI
B. reduces HBr or H
c. oxidises KBror KI
D. oxidises KBr to ( K B r O_{3} ) or ( K ) I to ( K I O_{3} )
12
90 Which is more easily reduced: Ca or O?
( mathbf{A} cdot mathbf{C a} )
( B . O )
C . Both are equally reduced
D. None of the above
12
91 ( F e^{3+} ) oxidises ( N H_{2} O H ) to
A ( cdot N O_{2} )
в. ( N_{2} ),
c. ( N_{2} )
D. ( N_{3} )
12
92 Ammonia is highly soluble in
water. Other gases showing similar solubility is/are :
A. hydrochloric gas
B. sulphur dioxide gas
c. chlorine
D. both A and B
12
93 Which of the following is a normal salt:
A. ( mathrm{NaH}_{2} mathrm{PO}_{2} )
в. ( mathrm{NaH}_{2} mathrm{PO}_{3} )
( mathbf{c} cdot mathrm{NaH}_{2} mathrm{PO}_{4} )
D. ( mathrm{Na}_{3} mathrm{PO}_{4} )
12
94 How many of the following substances
are soluble in concentrated ( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3} ) ?
( boldsymbol{B} boldsymbol{a} boldsymbol{S} boldsymbol{O}_{4}, boldsymbol{C} boldsymbol{u} boldsymbol{S}, boldsymbol{P b} boldsymbol{S}, boldsymbol{H} boldsymbol{g} boldsymbol{S} )
( A )
B. 2
( c cdot 3 )
D. 4
12
95 ( mathrm{CO}_{2} ) is gas, while ( mathrm{SiO}_{2} ) is solid
because:
( mathbf{A} cdot C O_{2} ) is a linear molecule, while ( S i O_{2} ) is angular.
B. van der Waals’ forces are very strong in ( S i O_{2} )
( mathrm{C} cdot mathrm{CO}_{2} ) is covalent, while ( mathrm{SiO}_{2} ) is ionic.
D. ( S i ) cannot form stable bonds with ( O ), hence ( S i ) has to form a ( 3 D ) lattice
11
96 One method of producing ( N H_{3} ) is by
heating ammonium chloride, ( N H_{4} C l )
with ( C a O )
( mathbf{2} N boldsymbol{H}_{4} boldsymbol{C l}+boldsymbol{C a O} rightarrow mathbf{2} boldsymbol{N} boldsymbol{H}_{3}+boldsymbol{C a} boldsymbol{C l}_{2}+ )
( boldsymbol{H}_{2} boldsymbol{O} )
Explain why the reaction of ( N H_{4} C l )
with ( C a O ) produces ammonia.
12
97 The correct statement among the
following is:
( mathbf{A} cdotleft(S i H_{3}right)_{3} N ) is pyramidal and more basic than ( left(C H_{3}right)_{3} N )
B. ( left(operatorname{Si} H_{3}right)_{3} N ) is planar and more basic than ( left(C H_{3}right)_{3} N )
C ( cdotleft(S i H_{3}right)_{3} N ) is pyramidal and less basic than ( left(C H_{3}right)_{3} N )
D. ( left(S i H_{3}right)_{3} N ) is planar and less basic than ( left(C H_{3}right)_{3} N )
12
98 In the raction ( S O_{2}+2 H_{2} S rightarrow 3 S+ )
( 2 H_{2} O, ) the substance that is oxidized is
( A cdot S O_{2} )
в. ( H_{2} ) О
( c cdot s )
D. ( H_{2} S_{S} )
12
99 Study the figure given below and
answer the questions that follow:
Name another gas which has the same
property and can be demonstrated
through this experiment.
12
100 Phosphine is prepared by the action of?
A . Pand ( H_{2} S O_{4} )
B. P and NaOH
c. P and ( H_{2} S )
D. P and ( H N O_{3} )
12
101 Which gas is essential constituent of
almost all fuel gases?
A. ( C O_{2} )
в. ( N_{2} )
( c cdot c o )
D. ( H_{2} O )
11
102 Bleaching action of ( S O_{2} ) is due to:
A. reduction
B. Oxidation
c. hydrolysis
D. None of the above
12
103 Which of the following is incorrect
about ( boldsymbol{H}_{mathbf{4}} boldsymbol{P}_{mathbf{2}} boldsymbol{O}_{mathbf{5}} ) ?
A. It contains ( P ) in +5 oxidation state
B. It is dibasic acid
c. It is strongly reducing in nature
D. It contains one ( P-O-P ) bond
12
104 Which one of the following is paramagnetic in nature?
A . ( N O )
в. ( N_{2} ),
c. ( N_{2} O_{5} )
D. All of the above
11
105 Assertion
Nitrous oxide is also known as laughing
gas
Reason
It is a colourless gas having a faint
sweet odour
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
106 Assertion
Each N-atom is ( s p^{3}- ) hybridised in
( N_{2} H_{4} )
Reason
It has gauche conformation
Read the above assertion and reason and
choose the correct statement regarding
it.
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
107 Assertion
Nitric oxide, though an odd electron molecule in diamagnetic in liquid state
Reason

There occurs only partial dimerisation
of ( N O ) to ( N_{2} O_{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. Assertion is incorrect but Reason is correct

12
108 Complete the following reaction:
( boldsymbol{H}_{2} boldsymbol{O}_{2}+boldsymbol{O}_{3} longrightarrow ? )
12
109 The synonym for water gas when used in the production of methanol is:
A. natural gas
B. laughing gas
c. syn gas
D. fuel gas
11
110 Which of the following has least tendency of catenation?
A. ( C )
B. ( S ) i
c. ( G e )
D. ( S n )
11
111 Which of the following are peroxoacids
of sulphur?
( mathbf{A} cdot H_{2} S O_{5} ) and ( H_{2} S_{2} O_{8} )
( mathbf{B} cdot H_{2} S O_{5} ) and ( H_{2} S_{2} O_{7} )
( mathbf{c} cdot H_{2} S_{2} O_{7} ) and ( H_{2} S_{2} O_{8} )
D. ( H_{2} S_{2} O_{6} ) and ( H_{2} S O_{5} )
12
112 Which of the following element occurs in free form in nature?
A. ( N )
в. ( P )
c. ( A s )
D. ( S b )
12
113 Which of the following is true for ( N_{2} O_{5} ) ?
A. Paramagnetic
B. Anhydride of ( H N O_{2} )
c. Brown gas
D. Exist in solid In form of ( left[N O_{2}^{+}right]left[N O_{3}^{-}right] )
12
114 Which substance could not be used as
a fuel to heat water in a boiler?
A. ethanol
B. hydrogen
c. methane
D. oxygen
12
115 Question 15. Why is H2O a liquid and H2S a gas?
Discuss different intermolecular interactions as these interations are
stronger in liquid as compared to a gas,
natiuitabe of 35) od
12
116 While preparing oxygen from potassium permanganate, the hard glass test tube must be held steady
A. True
B. False
12
117 What is the correct formula for
dinitrogen monoxide?
A ( cdot N_{2} O )
в. ( N_{2} O_{5} )
c. ( N_{4} O_{2} )
D. ( N O )
E. ( N O_{2} )
12
118 The acid used in lead storage cell is:
A. Phosphoric acid
B. Nitric acid
c. Sulphuric acid
D. Hydrochloric acid
12
119 Oleum on hydrolysis gives sulphuric
acid.
A . True
B. False
12
120 Dry chlorine is not collected over
mercury because:
A. of formation of mercuric chloride
B. of formation of amalgams
c. it is soluble in mercury
D. it is heavier than mercury
12
121 Explain the following:
Concentrated nitric acid appears yellow when it is left standing in a glass bottle.
12
122 A powerful oxidant in the list given below is :
A. ( H N O_{2} )
в. ( H N O_{3} )
( mathrm{c} cdot mathrm{H}_{3} mathrm{PO}_{4} )
D. ( H_{3} P O_{3} )
12
123 Name the compound of chlorine 1 which is an anesthetic 2 . which is used
as a refrigerant 3. which is a disinfectant 4. which is used to make
pipes and tubes
5. which liberates
chlorine on exposure to air.
12
124 Which of the following gas mixture is used by the divers inside the sea?
A. ( O_{2}+H e+N_{2} )
B. ( O_{2}+X e )
( mathbf{c} cdot O_{2}+A r+N_{2} )
D. ( O_{2}+N_{2} )
12
125 Both ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{3} ) and ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) are dibasic
acid. But, equimolar solutions of both acids do not contain equal
concentration of ( boldsymbol{H}^{+} ) ions. Give reason.
12
126 Some of the substances used in
making of a modern safety match box are listed below:-
a) Antimony trisulphide
b) Glass powder
c)Potassium chlorate
d) Red phosphorous The head of a modern safety match stick contains:
A. A and D
B. B and C
( c cdot c ) and ( D )
D. c and A
12
127 Assertion
Some farmers feel that lightning helps
produce better crop.
Reason
Lighting forms No which is converted to
( N o_{2}, H N O_{2} ) and ( H N O_{3} ) under
atomospheric condition. Thus, ( N O_{3}^{-} ) is a source of nutrients (fertilisers) to the
plant. Thus there are chances of better
crops when lightning occurs.

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
128 Which of the following oxides dissolves in water to form a strongly acidic
solution?
( mathbf{A} cdot N a_{2} O )
в. ( C a O )
c. ( A l_{2} O_{3} )
D. ZnO
E. ( S O_{3} )
12
129 Addition of nitric acid to acidified
FeSO serves as a test for the former
gives:
A. ferrous sulphate solution (brown black)
B. ferrous sulphate solution (brown)
c. ferrous sulphate solution (black)
D. ferrous sulphate solution (green)
12
130 Write most favourable conditions for
the conversion of ( S O_{2} ) into ( S O_{3} )
12
131 SU2 15 U 100
Question 22. How is the presence of SO, detected?
toetat detect the resence of
12
132 Which oxide of nitrogen is obtained on
heating ammonium nitrate at ( 250^{circ} mathrm{C} ) ?
A. Nitric oxide
B. Nitrous oxide
c. Nitrogen dioxide
D. Dinitrogen tetraoxide
12
133 The valency of noble gases is generally:
A . zero
B. one
c. three
D. two
12
134 Liquids flow from a higher to a lower level. Which liquid can climb up the walls of the glass vessel in which it is kept?
A. Liquid helium
B. Alcohol
c. water
D. Liquid nitrogen
12
135 A colourless gas ‘ ( x ) ‘ forms a brown
coloured gas ‘ ( y^{prime} ) when mixed with air. ( x )
and ( y ) could be :
A. ( N O, N O_{2} )
в. ( N O, O_{2} )
c. ( N O_{2}, N_{2} O_{4} )
D. ( N O, N_{2} O_{4} )
12
136 Which of the following pairs is the most acidic?
( A cdot N_{2} O_{5}, P_{2} O_{3} )
B. ( mathrm{N}_{2} mathrm{O}_{5}, mathrm{P}_{2} mathrm{O}_{5} )
( mathbf{c} cdot mathbf{H}_{3} mathbf{P} mathbf{O}_{4}, mathbf{H}_{3} mathbf{P} mathbf{O}_{3} )
D. None of the above
12
137 Which of the following belongs to the halogen family?
A. Francium
B. Polonium
c. Radium
D. Astatine
12
138 How does ozone react with the following
(i) ( P b S )
(ii) ( boldsymbol{K} boldsymbol{I} )
(iii) ( C_{2} H_{4} )
(iv) ( N O )
12
139 Sulfur dioxide can be anhydride for which of the following?
A. Sulfurous acid
B. Hyposulfurous acid
c. Sulfuric acid
D. Hydrosulfuric acid
12
140 Arrange the following in the increasing order of bond energy: ( boldsymbol{F}_{2}<boldsymbol{C l}_{2}<boldsymbol{O}_{2}< )
( N_{2} )
If true enter 1 , else enter 0 .
12
141 Which of the follwoing statements is
correct?
A. ( mathrm{HCl} ) is covalent both in aqueous solution and in the gaseous state
B. HCl is covalent in the gaseous state but ionic in aqueous solution
C. ( mathrm{HCl} ) is ionic both in the gaseous state and in aqueous solution
D. None of the above
12
142 The liquefied metal expanding on solidification is :
A . Ga
в. А।
( c cdot z n )
D. c
11
143 When ( S O_{2} ) gas is passed into aqueous
( N a_{2} C O_{3} ) the product(s) formed is (are):
A ( . ) NaHSO ( _{4} )
B. ( N a_{2} S O_{4} )
( mathbf{c} cdot operatorname{NaH} S O_{3} )
D. ( N a_{2} S O_{3} ) and ( N a H S O_{3} )
E. ( N a H S O_{4} ) and ( N a_{2} S O_{4} )
12
144 Which of the following statement is/are
correct?
This question has multiple correct options
A. Phosphoric acid is transparent solid.
B. Phosphoric acid melts as ( 44^{circ} mathrm{C} ).
C. Phosphoric acid absorbs water.
D. Phosphoric acid forms coloured syrupy mass.
12
145 The oxidation states of iodine in
( H I O_{4}, H_{2} I O_{5} ) and ( H_{5} I O_{6} ) are
respectively
A. +1,+3,+7
B. +7,+7,+3
( c cdot+7,+7,+7 )
( D cdot+7,+5,+3 )
12
146 Question 21. Comment on the nature of two S-O bonds formed in SO,
molecule. Are the two S-O bonds in this molecule equal?
12
147 The Group VA element that makes up part of bones and teeth is:
A.
B.
c. As
D. sb
12
148 Amongst the following compounds (I)
( boldsymbol{H}_{5} boldsymbol{P}_{3} boldsymbol{O}_{10},(text { II }) boldsymbol{H}_{6} boldsymbol{P}_{4} boldsymbol{O}_{13},(| text { II }) boldsymbol{H}_{5} boldsymbol{P}_{5} boldsymbol{O}_{15} )
and ( (mathrm{IV}) boldsymbol{H}_{7} boldsymbol{P}_{5} boldsymbol{O}_{16}, ) the non-cyclic
phosphates are:
A. I and III
B. I, II and III
c. ।, ॥ and IV
D. I, II, II and IV
12
149 One mole of calcium phosphide on reaction with an excess of water gives:
A. one mole of phosphine
B. two moles of phosphoric acid
c. two moles of phosphine
D. one mole of phosphorous oxide
12
150 Which one of the following is an amphoteric oxide?
( A cdot S O_{2} )
в. ( B_{2} O_{3} )
( c cdot Z n O )
D. ( N a_{2} O )
12
151 Assertion
Nitrogen turns red litmus paper blue.
Reason
Ammonia is a basic gas.
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
152 I. Oxidizing agents must include
oxygen.
II. Oxygen is a good electron acceptor.
A. Statement ( I ) is true, statement ( I I ) is true and is a correct explanation of the phenomena described in ( I )
B. Statement I is true, statement II is false
c. statement I is false, statement ( I I ) is true
D. Statement I is false, Statement ( I I ) is false
12
153 42. Dry bleach is done by
(1) Ozone
(2) Hydrogen peroxide
(3) Sulphur dioxide
(4) Chlorine
12
154 Nitrogen dioxide is released by
heating-
( mathbf{A} cdot P bleft(N O_{3}right)_{2} )
в. ( K N O_{3} )
c. ( N a N O_{2} )
D. ( N H_{4} N O_{3} )
12
155 The highest concentration of was found in Hartley coal ash.
A. Leadd
B. Germanium
c. Antimony
D. carbon
11
156 Oxygen gas is a Supporter of combustion and keeps the burning splinter glowing.
A. True
B. False
12
157 Animals breathe, oxygen and give
out
A. Carbon dioxide
B. Oxygen
c. Nitrogen
D. Hydrogen
12
158 ( 4 P+5 O_{2} rightarrow )
A. POS
B. 2P205
( c cdot 4 P O 4 )
D. 2P305
12
159 Which of the following displaces ( B r_{2} ) from an aquenous solution containing bromide ions?
A ( cdot C l )
в. ( C l_{2} )
( c cdot I_{3}^{-} )
D. ( I_{2} )
12
160 Which of the following is chemical formula of Oleum?
( A cdot H_{2} S_{2} O_{8} )
в. ( mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{5} )
( mathrm{c} cdot mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{4} )
D. ( mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{7} )
12
161 When ( C l_{2} ) gas is dissolved in water,
there is disproportion to ( H C l O ) and
( boldsymbol{H} boldsymbol{C l} )
A. True
B. False
12
162 From the two allotropes of sulphur, Rhombic sulphur and Monoclinic sulphur, which is more stable?
A. Rhombic
B. Monoclinic
c. Both are equally stable
D. None
12
163 Which one of the following oxy acid of fluorine exists?
( mathbf{A} cdot H O F )
в. ( H F O_{3} )
c. ( H F O_{4} )
D. ( H F O_{2} )
12
164 When molten sulphur is quenched, then which of the following is formed?
A. Monoclinic sulphur
B. Rhombic sulphur
c. crystex (plastic)
D. Gamma sulphur
12
165 ( mathrm{O}_{2} ) is denser than air and ( mathrm{so} ), it is
collected over:
( A cdot H_{2} O )
B. spirit
c. ( H g )
D. kerosene oi
12
166 Why is ( K O_{2} ) paramagnetic? 12
167 7.
The black part of a pencil is made of ……………
11
168 The correct order for acid strength is:
( mathbf{A} cdot A l_{2} O_{3}<S i O_{2}<P_{2} O_{3}<S O_{2} )
B. ( S i O_{2}<S O_{2}<A l_{2} O_{3}<P_{2} O_{3} )
( mathbf{c} cdot A l_{2} O_{3}<S i O_{2}<S O_{2}<P_{2} O_{3} )
D. ( S O_{2}<P_{2} O_{3}<S i O_{2}<A l_{2} O_{3} )
12
169 For the industrial preparation of nitric acid from ammonia, when ammonia is heated with excess air in presence of a
catalyst, at ( 900^{circ} mathrm{C}, mathrm{NO} ) is obtained. Which line of entry describes the undefined reagents, products and reaction conditions?
A . catalyst at room temperaure ( left(25^{circ} mathrm{C}right) ) and ( mathrm{NO}_{2} )
B. catalyst at room temperature ( left(25^{circ} mathrm{C}right) ) and ( N_{2} mathrm{O} )
C. catalyst hight pressure and ( N O_{2} )
D. catalyst hight pressure and ( N_{2} O_{3} )
12
170 Which of the following group 14 elements shows maximum tendency
towards catenation?
A. Iead
B. germanium
c. silicon
D. carbon
11
171 Which one among the following can be classified as amphoteric?
A. ( N a_{3} P O_{4} )
в. нс
c. маОН
D. ( H S O_{4}^{-} )
E ( cdot C_{2} O_{4}^{2} )
12
172 ( N H_{3} ) can enter into complex formation
due to:
A. hydrogen bonding
B. coordinate bond
c. covalent bond
D. ionic bond
12
173 Assertion
( P_{4} ) exists but ( N_{4} ) does not; ( N_{2} ) exists
but ( P_{2} ) does not
Reason
white phosphorus : ( boldsymbol{P}_{4} boldsymbol{N} equiv )
( N 946 k J m o l^{-1}, P equiv )
( boldsymbol{P} mathbf{4 8 1} boldsymbol{k} boldsymbol{J} boldsymbol{m o l}^{-1}, boldsymbol{N}- )
( N 160 k J m o l^{-1}, P-P 215 k J m o l^{-1} )
Greater the B.E., greater the stability [compare BE of ( N equiv N ) and ( N-N ) (in
( left.left.N_{4}right) text { and } P-Pleft(text { in } P_{4}right)right] )
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
174 Fill in the blanks.
Nitrogen is not a supporter of
12
175 Q. 31 Which of the following statements are correct.
Among halogens, radius ratio between iodine and fluorine is maximum.
(b) Leaving F – F bond, all halogens have weaker X – X bond than X-X’ bond
in interhalogens.
(c) Among interhalogen compounds maximum number of atoms are present in
iodine fluoride.
(d) Interhalogen compounds are more reactive than halogen compounds.
12
176 The amorphous form of silica is:
A. Quartz
B. Kieselguhr
c. Cristobalite
D. Tridymite
11
177 Which compound is solid?
A. ( C O_{2} )
в. ( N H_{3} )
( mathrm{c} cdot P H_{3} )
D. ( operatorname{si} 0_{2} )
11
178 A metal ( X ) when burnt in air, ( X ) -forms
oxide and nitride both. ( X ) can be:
( mathbf{A} cdot R b )
в. ( M g )
( c . N a )
D. ( K )
12
179 Which of the following is correct?
A. lodine is solid
B. Chlorine is insoluble in water.
C. lodine is more reactive than bromine.
D. Bromine is more reactive than chlorine.
12
180 ( mathbf{2} N_{2}+O_{2} longrightarrow )
A ( cdot N_{2} O )
в. ( N O_{2} )
c. ( N O )
D. ( N_{2} O_{2} )
12
181 In aluminate ion, the coordination
number of aluminium is:
( A cdot 2 )
B. 4
( c cdot 6 )
( D )
11
182 Which of the following halides cannot be hydrolyzed?
(I) ( boldsymbol{T} boldsymbol{e} boldsymbol{F}_{6},(|) boldsymbol{S} boldsymbol{F}_{6} )
(III) ( N C l_{3}, ) and ( (I V) )
( N F_{3} )
( mathbf{A} cdot|| ) and ( I mathbf{V} )
B. I, II and III
c. ।, ॥ and IV
D. II and IV
12
183 Assertion
Chlorine reacts with freshly prepared calcium hydroxide to produce bleaching powder.
Reason
Chlorine has a great affinity for
hydrogen.
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
184 Assertion
Sulphuric acid reacts with sodium chloride in the following way:
( 2 mathrm{NaCl}+boldsymbol{H}_{2} boldsymbol{S O}_{4} rightarrow 2 mathrm{HCl}+boldsymbol{N} boldsymbol{a}_{2} boldsymbol{S O}_{4} )
Reason
Sulphuric acid because of its low
volatility can be used to manufacture
more volatile acids from their
corresponding salts.
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
185 The oxoacid of sulphur which contains
two sulphur atoms in different
oxidation states is:
A. pyrosulphurous acid
B. hyposulphurous acid
c. pyrosulphuric acid
D. persulphuric acid
12
186 Which of the followings is/are correct?
This question has multiple correct options
A. In the structure of ( I F_{2}^{+} ) bond angle is smaller than the tetrahedral angle because of lone pair-lone pair repulsion
B. In the structure of ( I F_{4}^{+} ), there is ( s p^{3} ) hybridisation with bond angle of ( 109^{circ} 28^{prime} )
C. In the structure of ( I F_{6}^{+} ), there are six bonding electrons and no lone pairs
D. In the structure of ( I F_{4}^{+} ), two F-atoms one at equatorial positions and two are inclined at an angle less than ( 120^{circ} ) due to lone pair-bond pair repulsion
12
187 Marshall’s acid is:
( mathbf{A} cdot H_{2} S O_{5} )
( mathbf{B} cdot H_{2} S_{2} O_{7} )
( mathbf{c} cdot H_{2} S_{2} O_{3} )
D. ( H_{2} S_{2} O_{8} )
12
188 ( N H_{3} ) has much higher boiling point
than ( P H_{3} ) because:
A. ( N H_{3} ) has much higher molecular mass
B. ( N H_{3} ) forms hydrogen bonds
c. ( N H_{3} ) contains ionic bonds while ( P H_{3} ) contains covalent bonds
D. ( N H_{3} ) undergoes umbrella inversion.
12
189 Which is wrong about ( boldsymbol{O}_{3} )
A. It is paramagnetic in nature
B. It has a linear structure
c. It decolourizes acidic ( K M n O_{4} )
D. All
12
190 To a piece of charcoal sulfuric acid is
added. Then
A. there is no reaction
B. water gas is formed
( mathrm{c} cdot mathrm{SO}_{2} ) and ( mathrm{CO}_{2} ) are evolved
D. ( C O ) and ( S O_{2} ) are evolved
12
191 ( C N^{-} ) and ( N_{2} ) are isoelectronic. But in
contrast to ( C N^{-}, N_{2} ) is chemically
inert because of:
A. smaller ( N-N ) bond energy
B. I arger ( N-N ) bond energy
c. low inoziation enthalpy
D. none of these
12
192 White phosphorous is more reactive
due to:
A. bond angle strain
B. its polymeric nature
c. both of them
D. less density
12
193 Among ( boldsymbol{C a} boldsymbol{C l}_{2}, boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) and ( boldsymbol{C a O}, ) which
compound can be used for the drying of ammonia gas? Why?
12
194 Concentrated nitric acid is converted to
sulphuric acid by the reaction with:
A. Sulphur dioxide
B. conc.sulphuric acid
c. sulphur
D. Sulphur trioxide
12
195 The correct order of stability of the halous acids in aqueous solution is:
A. ( mathrm{HClO}<mathrm{HBrO}mathrm{HBrO}mathrm{HBrO}> ) HlO
D. HClO HlO
12
196 What happens when ortho phosphoric
acid is heated to ( 600^{circ} mathrm{C} ) ?
A. Phosphorus is formed
B. Phosphorus acid is formed
c. Hydrogen gas is released
D. Phosphorus pentaoxide is formed
12
197 Kjeldahl’s method cannot be used for:
This question has multiple correct options
A ( . P h N O_{2} )
в. ( P h N H C O P h )
c. Azobenzene
D. Pyridine
12
198 Find the number of nitrates which gives
( N O_{2} ) gas on heating from the following:
Nitrogen dioxide is released on heating:
( N H_{4} N O_{3}, K N O_{3}, N a N O_{2}, P bleft(N O_{3}right)_{2} )
12
199 Consider the following statements
regarding halides of ( boldsymbol{S} )
(i) ( S F_{4} ) and ( S C l_{4} ) act as Lewis acid only.
(ii) ( S F_{4} ) and ( S C l_{4} ) act as Lewis base
only.
(iii) ( S F_{4} ) and ( S C l_{4} ) act both as Lewis acid and Lewis base.
The correct option is:
A. both (ii) a (iii) are correct
B. both (i) a (ii) are correct
c. only (iii) is correct
D. all are correct
12
200 Which are the correct statements for
( N O_{2} ? )
This question has multiple correct options
A. It is paramagnetic and dimerizes to ( N_{2} O_{4} )
B. ( N_{2} O_{4} ) is planar and diamagnetic.
( mathrm{C} cdot mathrm{N} mathrm{O}_{2} ) is linear containing an odd number of electrons.
D. N-O bonds in ( N O_{2} ) are different lengths.
12
201 Chlorine was discovered by:
A. Priestley
B. Davy
c. shceele
D. Cavendish
12
202 In which one of the following compounds does sulphur have the least oxidation number?
( A cdot S O_{2} )
в. ( mathrm{H}_{2} mathrm{SO}_{4} )
( mathrm{c} cdot mathrm{Na}_{2} mathrm{S}_{2} mathrm{O}_{3} )
D. ( mathrm{Na}_{2} mathrm{S}_{4} mathrm{O}_{6} )
12
203 Which of the following oxides of nitrogen is anhydride of nitric acid?
A ( cdot mathrm{N}_{2} mathrm{O}_{3} )
B. ( N_{2} O_{4} )
( mathbf{c} cdot mathbf{N}_{2} mathbf{O}_{mathbf{5}} )
( D cdot N_{2} O )
12
204 Q.36 Match the species given in Column I with the properties mentioned in
Column II.
A.
B.
C.
D.
Column
BF
AICI;
Sno
PbO
Column II
1. Oxidation state of central atom is +4
2. Strong oxidising agent
13. Lewis acid
4. Can be further oxidised
5. Tetrahedral shape
11
205 Gases ( X ) and ( Y ) are respectively:
A. ( C l_{2}, I_{2} )
в. ( H C l, I_{2} )
c. ( H C l, H I )
D. ( H C l O, I_{2} )
12
206 Which one of the following group 16 elements does not exist in -2 oxidation
state?
A . ( S )
в. ( S e )
( c cdot O )
D. ( P o )
E . ( T e )
12
207 Q7. Give reason why boron and aluminium tend to form covalent compounds.
11
11
208 Q. 17 On heating ammonium dichromate and barium azide separately we get
(a) N2 in both cases
(b) N, with ammonium dichromate and NO with barium azide
(c) N, O with ammonium dichromate and N, with barium azide
(d) N, O with ammonium dichromate and NO, with barium azide
minim dichromate and harium azide it produces N
as senarately
12
209 0.29 Which of the following options are not in accordance with the property
mentioned against them?
(a) F, > Cl2 > Br2 > I Oxidising power
(b) MI > MBT > MCI > MF lonic character of metal halide
(C) F > CI, > Br, >1, Bond dissociation enthalpy
(d) HI < HBr <HCI <HF Hydrogen-halogen bond strength
12
210 Equivalent weight of ( S O_{2} ) is found to be 32 in a reaction taking place in acidic medium. This reaction is represented
as ( boldsymbol{S O}_{2}+mathbf{2 H}_{2} boldsymbol{O} rightarrow boldsymbol{S} boldsymbol{O}_{4}^{2-}+boldsymbol{4} boldsymbol{H}^{+}+ )
( mathbf{2} e^{-} )
State whether the given reaction take place in backward direction or forward
direction?
12
211 Assertion:
( mathbf{P}_{4} ) is more reactive than ( mathbf{N}_{2} )
Reason:
( mathbf{P}-mathbf{P} ) bonds are relatively weaker than
( mathbf{N}-mathbf{N} )
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
212 Which of the following arrangement of bond dissociation enthalpy of halogens is correct?
A. ( F-F>C l-C l>B r-B r )
В. ( F-F<C l-C lC l-C l<B r-B r )
D. ( F-FB r-B r )
12
213 Ammonia forms the complexion
( left[boldsymbol{C u}left(boldsymbol{N} boldsymbol{H}_{3}right)_{4}right]^{2+} ) with copper ions in the
alkaline solution because:
A. in acidic solutions, protons coordinate with ammonia molecules
B. in acidic solutions, hydration protects copper ions.
c. in alkaline solutions, insoluble ( C u(O H)_{2} ) is precipitated which is soluble in excess of any alkali
D. copper hydroxide is an atmospheric substance.
12
214 Which halogen has the highest value of negative electron gain enthalpy?
A. Fluorine
B. Chlorine
c. Bromine
D. lodine
12
215 The two types of bonds present in ( B_{2} H_{6} ) are covalent and ionic bond. If true enter
1, else enter 0
11
216 Q Type your question-
( (boldsymbol{C}) stackrel{bullet}{longrightarrow}(boldsymbol{A})+(boldsymbol{D}) )
conc. solution of ( (C) frac{operatorname{conc.H}_{2} S O_{4}}{(E)} )
(weak acid)
( (D)+ ) cobalt oxide ( stackrel{Delta}{longrightarrow}(F) ) (coloured
bead)
( (boldsymbol{E})+boldsymbol{C}_{2} boldsymbol{H}_{5} boldsymbol{O} boldsymbol{H} stackrel{boldsymbol{Delta}}{longrightarrow} ) green edged flame
( (G) )
( A ) to ( G ) based on the following reactions
are:
( mathbf{A}: boldsymbol{N} boldsymbol{a} boldsymbol{B} boldsymbol{O}_{2} )
( mathbf{B}: boldsymbol{C O}_{mathbf{2}} )
( mathbf{C}: boldsymbol{N} boldsymbol{a}_{2} boldsymbol{B}_{4} boldsymbol{O}_{7} )
( mathrm{D}: B_{2} O_{3} )
E: ( boldsymbol{H}_{3} boldsymbol{B} boldsymbol{O}_{3} )
( mathrm{F}: boldsymbol{C o}left(boldsymbol{B O}_{2}right)_{2} )
( mathrm{G}:left(C_{2} H_{5} Oright)_{3} B )
If the statement is true enter 1 , else
enter 0
11
217 ( N H_{4}^{+} ) is iso structural with:
A ( cdot P C l_{3} )
в. ( C H_{4} )
( mathrm{c} cdot B F_{3} )
D. ( N O_{3} )
12
218 Assertion
Graphite cannot be converted into
diamond.
Reason
Graphite is conducting 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.
11
219 How many ( S-S ) linkage(s) is/are
present in sodium tetrathionate?
( A cdot 4 )
B. 3
( c cdot 2 )
D.
12
220 ( B F_{3} ) dimerizes to form stable molecule.
Enter 1 if true else enter 0
11
221 Find the number of ( S-S ) linkage in
( boldsymbol{H}_{2} boldsymbol{S}_{2} boldsymbol{O}_{3} )
12
222 Which of the following pentahalides does not exist?
A. PF ( _{5} )
B. ( mathrm{PCl}_{5} )
c. ( mathrm{PBr}_{5} )
D. PI
12
223 Which of the following halide of nitrogen is stable in nature?
A. ( N F_{3} )
в. ( N C l_{3} )
c. ( N B r_{3} )
D. ( N I_{3} )
12
224 Give reasons of the following:
( N_{2} O_{5} ) is more acidic than ( N_{2} O_{3} )
12
225 lonisation energy of ( O_{2} ) to ( O^{+} ) O2is very
similar to the ionization energy of ( X e ) to
( boldsymbol{X} boldsymbol{e}^{+} )
A. True
B. False
12
226 Which of the following is not the application of nitrogen?
A. Refrigerant
B. Metallurgy
c. Match sticks
D. Electric bulbs
12
227 Assertion
Both ( S O_{2} ) and ( S O_{3} ) are reducing agents
Reason

Both ( S O_{2} ) and ( S O_{3} ) bleach the articles
by reduction
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
228 When ether is exposed to air for sometime an explosive substance
produced is:
A. peroxide
B. oxide
c. тNT
D. superoxide
12
229 Complete the following reaction:
( N a N O_{3}+N H_{4} C l longrightarrow ? )
( mathbf{A} cdot N a N O_{3}+N H_{4} C l longrightarrow N H_{4} N O_{3}+N a C l stackrel{Delta}{rightarrow} N_{2} O+ )
( 2 H_{2} O )
B ( cdot N a N O_{3}+3 N H_{4} C l longrightarrow 2 N H_{4} N O_{3}+N a C l triangleq N_{2} O+ )
( 2 H_{2} O )
( mathbf{c} cdot 2 N a N O_{3}+3 N H_{4} C l longrightarrow 2 N H_{4} N O_{3}+2 N a C l triangleq )
( N_{2} O+2 H_{2} O )
D. None of these
12
230 Which of the following is paramagnetic
in nature?
A. ( N_{2} O_{4} )
в. ( N_{2} )
( c cdot N O_{2} )
D. ( N_{2} O_{5} )
12
231 nud Suppery.
Q26. (a) Classify following oxides as neutral, acidic, basic or amphoteric
CO,B,O,, SiO,, CO,, A1 O2, PbO2, T1,03.
(b) Write suitable equations to show their nature.
Cocopie TI . Amphetoric_AL
11
232 On heating coal with conc. Sulphuric acid, we get :
A. ( S O_{3} )
в. ( C O_{2} ) and ( S O_{2} )
( c cdot N_{2} )
D. ( C O_{2} )
12
233 The oxides of nitrogen which show neither acidic nor basic properties are :
A. ( N O, N_{2} O_{3} )
B. ( N_{2} O, N O )
c. ( N O, N_{2} O_{4} )
D. ( N_{2} O, N_{2} O_{4} )
12
234 In the following reaction
[
begin{array}{c}
boldsymbol{X} boldsymbol{e} boldsymbol{F}_{2}+boldsymbol{B} boldsymbol{r} boldsymbol{O}_{3}^{-}+boldsymbol{H}_{2} boldsymbol{O} longrightarrow boldsymbol{X} boldsymbol{e}+ \
boldsymbol{B r} boldsymbol{O}_{4}^{-}+mathbf{2} boldsymbol{H} boldsymbol{F}
end{array}
]
equivalent mass of ( B r O_{3}^{-}= )
molar mass
12
235 When chlorine water is added to a
solution of ( K B r, ) the solution
immediately turns orange red, because
A. Chlorine is reduced to chloride ion
B. of the formation of ( B r C l )
c. Bromide ion is oxidized to bromine
D. of the formation of ( B r_{3} )
12
236 Phosphorus trichloride reacts with phosphorus acid to give pyrophosphoric acid.
A. True
B. False
12
237 What is the basicity of orthophosphorus
acid?
A. one
B. Two
c. Three
D. Four
12
238 Which of the following statement is
wrong?
This question has multiple correct options
A. The stability of hydride increases from ( mathrm{NH}_{3} ) to ( mathrm{BiH}_{3} ) in group 15 of the periodic table.
B. Nitrogen cannot form ( mathrm{d} pi-mathrm{p} pi ) bond.
C. single ( mathrm{N}-mathrm{N} ) bond is weaker than the single P-P bond.
D. ( mathrm{N}_{2} mathrm{O}_{4} ) has two resonance structures.
12
239 Give chemical equations to manufacture of Sulphuric Acid by
Contact process.
12
240 Mercury in the presence of ozone is
oxidised to mercuric oxide.

If the given statement is true enter 1 else enter 0
A. True
B. False

12
241 a
Stable electronic contigurationis,
0.25 In solid state PCL5 is a ……….
(a) covalent solid
(b) octahedral structure
(c) ionic solid with [PCI.] octahedral and [PCIAT tetrahedral
(d) ionic solid with [ PCL IT tetrahedral and [PCIoctahedral
12
242 Give the reaction of dichlorine gas with
cold and dilute and hot and
concentrated ( N a O H_{(a q)} )
12
243 Anhydride of nitrous acid is:
в. ( N O )
c. ( N_{2} O_{3} )
D. ( N_{2} O_{4} )
12
244 Which of the following is not a
chalcogen?
A. ( O )
B. ( S )
( c . S e )
D. ( P )
12
245 The percentage of p-character in the orbitals forming P-PP-P is:
A . 25
B. 33
( c .50 )
D. 75
12
246 How many number of faces are there in
( P_{4} ) molecule?
12
247 Borax is not used?
A. as a styptic to stop bleeding
B. in making enamel and pottery glazes
C . as a flux in soldering
D. in making optical glasses.
11
248 Match list 1 and list 2 .
List – List
A) ( C O+H_{2} )
1. Producer
gas
B) ( C O+N_{2} )
2. Semi
water gas
C) ( boldsymbol{C O}+boldsymbol{H}_{2}+boldsymbol{N}_{2} )
3. Water gas
D) ( boldsymbol{H}_{2}+boldsymbol{C} boldsymbol{H}_{4}+boldsymbol{C O} )
4. Coal gas
( A cdot 1342 )
B. 2 4 13
( c .3124 )
D. 1432
11
249 The following acids have been arranged in the order of decreasing acid strength. Identify the correct orderCIOH(I) ( quad ) BrOH(II) ( quad mid O H(| I) )
B. ॥>1>111
( c cdot|mid>|>1 )
12
250 The facts that are true among the
following are:

This question has multiple correct options
A. The electron affinity of oxygen is less than that of ( s ) but greater than that of Se
B. For Polonium, +4 oxidation state is more stable than
+6 state
C. S-S-S bond angle is ( 60^{circ} ) in ( S_{8} ) ring
D. Dissociation constant is minimum for ( H_{2} O ) among
the hydrides of 16 th group elements.

12
251 [
boldsymbol{X} boldsymbol{e} boldsymbol{F}_{6} stackrel{text {Complete } boldsymbol{H} boldsymbol{y} text {drolysis}}{boldsymbol{P}}+
]
other product
[
begin{array}{l}
downarrow boldsymbol{O H}^{-} / boldsymbol{H}_{2} boldsymbol{O} \
boldsymbol{Q} \
downarrow
end{array}
]
slow disproportionation in ( O H^{-} / H_{2} O )
Products
Under ambient conditions, the total
number of gases released as products in the final step of the reaction scheme
shown below is:
A . 0
B. 1
( c cdot 2 )
D. 3
12
252 Fill in the blanks.
Boiling point of nitrogen
12
253 Q10. What is producer gas? 11
254 The reaction of Xe with an excess of ( mathbf{F}_{2} )
at high pressure and 573 K yields:
A. ( mathrm{XeF}_{2} )
в. ( mathrm{xeF}_{4} )
c. ( mathrm{xeF}_{6} )
D. XeF ( _{3} )
12
255 Quicklime is not used to dry ( H C l ) gas because ( _{—}-_{-}(C a O ) is alkaline ( mathrm{CaO} ) is acidic, ( mathrm{CaO} ) is neutral 12
256 Which of the following can be oxidized
by ( boldsymbol{S O}_{2} )
( mathbf{A} cdot M g )
в. ( K_{2} C r_{2} O_{7} )
( mathbf{c} cdot K M n O_{4} )
D. All
12
257 What would be the effect on burning if
the proportions of nitrogen and oxygen in air were reversed?
A. The atmosphere would be explosive
B. Oxygen reacting with the nitrogen to form poisonous nitrous oxides
c. The digestion of protein would be affected
D. All of the above
12
258 ( boldsymbol{S} boldsymbol{O}_{2} ) reduces ( boldsymbol{M} boldsymbol{n} boldsymbol{O}_{4}^{-} ) to ( boldsymbol{M} boldsymbol{n}^{2+} . ) Number
of electrons involved in the reduction of
( M n O_{4}^{-} ) to ( M n^{2+} ) is :
12
259 Write the equation for the formation of ammonia by the action of water on magnesium nitride.
A ( cdot 2 M g_{3} N_{2}+6 H_{2} O rightarrow 2 N H_{3}+6 M g(O H)_{2} )
В ( cdot M g_{3} N_{2}+3 H_{2} O rightarrow N H_{3}+3 M g(O H)_{2} )
( mathrm{c} cdot_{3 M g_{3} N_{2}+6 H_{2}} O rightarrow 6 N H_{3}+3 M g(O H)_{2} )
D. ( M g_{3} N_{2}+6 H_{2} O rightarrow 2 N H_{3}+3 M g(O H)_{2} )
12
260 Which of the following statement(s) is/are correct when a mixture of ( N a C l )
and ( K_{2} C r_{2} O_{7} ) is gently warmed with
conc. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ? )
This question has multiple correct options
A. A deep red vapor is evolved.
B. The vapor when passed into NaOH solution gives yellow solution of ( N a_{2} C r O_{4} )
c. chlorine gas is evolved.
D. chromyl chloride is formed.
12
261 Which among the following is a paramagnetic compound?
A ( cdot N_{2} O )
B. ( N O )
( mathrm{c} cdot mathrm{N}_{2} mathrm{O}_{3} )
D. ( N_{2} O_{4} )
12
262 Q38. If the starting material for the manufacture of silicons is RSiCl,, write the structure of the
product formed.
1211
11
263 How does ammonia react with solution
of Cu?
12
264 Which of the following bonds has the highest energy?
A. Se-Se
в. Te-Te
c. s-s
D. 0-0
12
265 Which of the following equations indicates the oxidizing property of
( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ? )
A. ( H_{2} S O_{4} rightarrow S O_{3}+H_{2} O )
B. ( H_{2} S O_{4} rightarrow H_{2} S O_{3}+H_{2} O )
c. ( H_{2} S O_{4} rightarrow S O_{2}+H_{2} O+[O] )
D. ( H_{2} S O_{4} rightarrow S O_{3}+2[H] )
12
266 How does Ozone react with the
following?
(i) ( P b S )
(ii) ( C_{2} H_{4} )
(iii) ( boldsymbol{A} boldsymbol{g} )
(iv) ( boldsymbol{H} boldsymbol{g} )
12
267 Chemically inert halide of sulphur is:
A ( cdot S C l_{2} )
в. ( S F_{2} )
c. ( S F_{4} )
D. ( S F_{6} )
12
268 Which of the following order of acidic strength is correct?
A. ( H C l O>H C l O_{2}>H C l O_{3}>H C l O_{4} )
в. ( H C l O_{4}>H C l O_{2}>H C l O_{3}>H C l O )
с. ( H C l O_{2}>H C l O>H C l O_{4}>H C l O_{3} )
D. ( H C l O_{4}>H C l O_{3}>H C l O_{2}>H C l O )
12
269 Which of the following oxides are not
neutral?
This question has multiple correct options
A. ( C O )
B. ( S n O_{2} )
( c cdot Z n O )
D. ( operatorname{si} O_{2} )
12
270 Ammonia acts as a:
A . reducing agent
B. oxidising agent
C . bleaching agent
D. both ( A ) and ( c )
12
271 Peroxonitrous acid is an unstable
intermediate formed in the oxidation of
( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{2} ) by ( boldsymbol{H}_{2} boldsymbol{O}_{2} )
“Peroxonitrous acid has the same
formula as nitric acid, ( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3} )
Answer whether the above statement is
true or false.lf true enter 1 , else 0
12
272 Among these ores the highest phosphorus content is in :
A. chlorapatite.
B. phosphorite
c. fluorspar.
D. equal
12
273 Phosphine is not obtained, when:
A. red phosphorous us heated with ( N a O H )
B. white phosphorous is heated with ( N a O H )
C ( cdot C a_{3} P_{2} ) reacts with water
D. phosphorous trioxide is boiled with water
12
274 ( H_{3} B O_{3} ) is a:
A. monobasic acid and weak Lewis acid
B. monobasic acid and weak Bronsted acid
C. monobasic acid and strong Lewis acid
D. tribasic acid and weak Bronsted acid
11
275 Which reaction is more spontaneous theoretically?
A . ( I )
B. II
c. Both equally
D. Can’t be predicted
12
276 Which of the following statements are correct statement(s) about
pyrophosphoric acid ( left(boldsymbol{H}_{4} boldsymbol{P}_{2} boldsymbol{O}_{7}right) ) ?
This question has multiple correct options
A. It contains P in +5 oxidation state
B. It is dibasic acid
c. It is a reducing agent
D. It contains one P-O-P bond
12
277 The correct order of
pseudohalide,polyhalide and interhalogen are
( mathbf{A} cdot B r I_{2}^{-}, O C N^{-}, I F_{5} )
B ( cdot I F_{5} cdot B r I_{2}^{-}, O C N^{-} )
( mathbf{c} cdot O C N^{-}, I F_{5}, B r I_{2}^{-} )
D. ( O C N^{-}, B r I_{2}^{-}, I F_{5} )
12
278 Which one of the following pentafluorides cannot be formed?
A. ( P F_{5} )
B. ( A s F_{5} )
( mathrm{c} . S b F_{5} )
D. ( B i F_{5} )
11
279 Which is the lightest gas?
A. Helium
B. Oxygen
c. Hydrogen
D. Nitrogen
12
280 Strongest reducing agent of the following is :
( A cdot H_{2} O )
в. ( mathrm{H}_{2} mathrm{s} )
c. ( mathrm{H}_{2} mathrm{Se} )
D. ( mathrm{H}_{2} mathrm{Te} )
12
281 Anhydrous borax is:
( mathbf{A} cdot N a_{2} B_{4} O_{7} )
B. ( N a_{2} B_{4} O_{7} .5 H_{2} O )
( mathbf{c} cdot N a_{2} B_{4} O_{7} cdot 10 H_{2} O )
D. ( N a_{2} B_{4} O_{7} .8 H_{2} O )
11
282 ( ln P C l_{5}, ) how many ( (C l-P-C l) ) are
inclined at ( 120^{circ} ) with one each :
12
283 Dry ( S O_{2} ) does not bleach dry flowers
because:
A. nascent hydrogen responsible for bleaching is produced only in presence of moisture
B. water is the actual reducing agent responsible for bleaching
C. water is_stronger acid than ( S O_{2} )
D. the ( O H^{-} ) ions produced by water cause bleaching
12
284 When white phosphorus is heated at ( 473 mathrm{K} ) under high pressure, what will happen?
A. ( alpha ) – Black phosphorus is formed
B. ( beta ) -Black phosphorus is formed
c. Red phosphorus is formed.
D. No change would be observed
12
285 3 Y ULUSPICIOUS
Ans. Ammonia (NH) on catalytic oxidation by atmospheric oxygen in presence of Rh/Pt gauge
at 500K under pressure of 9 bar produces nitrous oxide.
Balanced chemical reaction can be written as
Pt/Rh gauge catalyst
4NH3 + 502
500 K 9 bar
From air
bereid
12
286 White phosphorus on reaction with
NaOH gives ( P H_{3} ) as one of the products.
This is a?
A. Dimerisation reaction
B. Disproportionation reaction
c. condensation reaction
D. Precipitation reaction
12
287 Oxygen exhibits its +ve oxidation
states in its:
A. Fluorides
B. Chlorides
C. Nitrides
D. Sulphides
12
288 Which of the following statements
regarding sulphur dioxide is not true?
( A cdot S O_{2} ) is an angular molecule
B. ( S O_{2} ) may be regarded as the resonance hybrid of two canonical structures
( mathrm{C} cdot S mathrm{O}_{2} ) is an anhydride of sulphuric acid
D. ( S O_{2} ) is an anhydride of sulphurous acid
12
289 An orange solid ( (X) ) on heating, gives a colourless gas (Y) and a only green residue (Z). Gas (Y) on treatment with
Mg, produceds a white solid
substance
A. ( M g_{3} N_{2} )
2
в. ( M g O )
c. ( M g_{2} O_{3} )
D. ( M g C l_{2} )
12
290 The lightest noble gas atom contains the following particles in its nucleus:
A. 4 protons
B. 3 neutrons
c. 3 protons and 1 neutron
D. 2 protons and 2 neutrons
12
291 Oxides which show both acidic and
basic nature are called as
oxides.
12
292 Nitric acid is yellow in colour when:
A. freshly prepared
B. dissolved oxides of nitrogen are present
c. water is dissolved
D. None of the above
12
293 The inert gas which cannot be adsorbed over activated coconut charcoal?
A . Ne
B. Ar
c. не
D. ( mathrm{Kr} )
12
294 Draw the structure of the molecule
( C l F_{3} ) and state its geometry.
12
295 Write the name and structure of any five
oxyacids of sulphur?
12
296 Name the gas in each of the following:
The gas produced on reaction of dilute sulphuric acid with a metallic sulphide
12
297 Photochemical among is due to the
presence of :
A. Oxides of sulphur
B. Oxides of nitrogen
c. Oxides of carbon
D. Lead
12
298 What is the structure of phosphorus
trichloride?
A. Trigonal Pyramidal
B. Trigonal Planar
c. Tetrahedral
D. Square Planar
12
299 Q24. How would you explain the lower atomic radius of Ga as compared to Al?
Co the electrons in gallium experi
11
300 The yellow colour of ( H N O_{3} ) is due to the
dissolution of nitrogen dioxide ( left(N O_{2}right) )
A. True
B. False
12
301 A greenish yellow gas of halogen family turns moist blue litmus paper red.
A. True
B. False
12
302 Oleum is:
A. castor oil
B. oil of vitriol
C. fuming sulphuric acid
D. none of these
12
303 Q. 12 Which of the following elements does not show allotropy:
(a) Nitrogen (b) Bismuth (c) Antimony (d) Arsenic
Ans (a) Nitrogen done not nhau
and Therefore abilit
12
304 Assertion (A): The basic nature of VA
group hy-drides decreases from ammonia to bismuthine.
Reason (R): Availability of lone pair on the cen-tral atom in hydrides decreases
down the group.
A. Both (A) and (R) are true and
(R) is the correct
explanation of (A)
B. Both (A) and (R) are true and (R) is not the
correct explanation of (A)
( c . ) (A) is true and
(R) is false
D. (A) is false but (R) is true
12
305 Three reactions involving ( mathbf{H}_{2} mathbf{P} mathbf{O}_{4}^{-} ) are given below:
(i) ( mathbf{H}_{3} mathbf{P} mathbf{O}_{4}+mathbf{H}_{2} mathbf{O} rightarrow mathbf{H}_{3} mathbf{O}^{+}+mathbf{H}_{2} mathbf{P} mathbf{O}_{4}^{-} )
(ii) ( mathbf{H}_{2} mathbf{P} mathbf{O}_{4}^{-}+mathbf{H}_{2} mathbf{O} rightarrow mathbf{H} mathbf{P} mathbf{O}_{4}^{2-}+mathbf{H}_{3} mathbf{O}^{+} )
(iii) ( mathbf{H}_{2} mathbf{P O}_{4}^{-}+mathbf{O H}^{-} rightarrow mathbf{H}_{3} mathbf{P} mathbf{O}_{4}+mathbf{O}^{2-} )
In which of the above reactions, does
( H_{2} P O_{4}^{-} ) act as an acid?
A . (ii) only
B. (i) and (ii)
( c . ) (iii) only
D. (i) and (iii)
12
306 – 6 Расу о песьма
Q18. How is excessive content of Co, responsible for global warming?
11
307 Which one of the following reactions of xenon compounds is not feasible?
A ( cdot 3 X e F_{4}+6 H_{2} O longrightarrow 2 X e+X e O_{3}+12 H F+1.5 O_{2} )
B . ( 2 X e F_{2}+2 H_{2} O rightarrow 2 X e+4 H F+O_{2} )
( mathbf{c} cdot_{X e F_{6}+R b F} rightarrow R bleft[X e F_{7}right] )
D. ( X e O_{3}+6 H F rightarrow X e F_{6}+3 H_{2} O )
12
308 Give reasons why a paper written in
ordinary ink is bleached by chlorine whereas it cannot bleach printed ink.
12
309 Municipality officials use chlorine in water purification because:
A. chlorine cleans water
B. chlorine helps water to cool easily
c. chlorine coagulates mud particles
D. chlorine kills harmful bacteria
12
310 a) Write a chemical equation to prepare ammonia from ammonium chloride?
b) Write a chemical equation to identify
( C u^{+2} & A g^{+} ) ions with the application
of ( N H_{3} ? )
c) Draw a labeled diagram showing flowchart for the manufacture of
ammonia?
12
311 Straight chain silicones are prepared by hydrolysis by:
A ( cdot R_{2} S i C l_{2} )
в. ( R_{3} ) SiCl
c. ( R S i C l_{3} )
D. ( R_{2} ) Si
11
312 4. The oxidation number of sulphur in S, S,FHS
respectively are:
(a) 0, +1 and 2 (b) +2, +1 and -2
(c) 0, +1 and +2 (d) -2, +1 and -2
12
313 On hydrolysis of interhalogen compound,oxyhalide ion is formed from:
A. larger halogen
B. smaller hallogen
c. both the halogens
D. more electronegative halogen
12
314 Gas ( A ) is formed on the hydrolysis of
calcium cyanamide. The gas can turn moist litmus paper blue and forms a brown precipitate with Nessler’s
reagent. The gas, ( boldsymbol{A} ) is:
A ( cdot N_{2} )
B. NO
( c cdot N O_{2} )
D. ( N H_{3} )
12
315 Sulphuryl chloride ( left(boldsymbol{S} boldsymbol{O}_{2} boldsymbol{C l}_{2}right) ) reacts
with white phosphorus ( left(P_{4}right) ) to give:
A. ( P C l_{5}, S O_{2} )
в. ( O P C l_{3}, S O C l_{2} )
c. ( P C l_{5}, S O_{2}, S_{2} C l_{2} )
D. ( O P C l_{3}, S O_{2}, S_{2} C l_{2} )
12
316 Fill in the blanks by choosing the appropriate word/words from those given in the brackets:
(square pyramidal, electrical, 74, 26, ( s p^{3} d^{2}, s p^{3} d, ) chemical, 68,32
tetrahedral, yellow, white, iodoform, Lucas)
The shape of ( X e O F_{4} ) molecule is
and the
hybridisation of xenon atom in the
molecule is
12
317 When potassium magnate is treated with ozone, the compound obtained as product is:
( mathbf{A} cdot K M n O_{4} )
в. ( M n O_{2} )
c. ( M n O_{4} )
D. all of these
12
318 aqueous ( N a O H+P_{4}(w h i t e) longrightarrow )
( boldsymbol{P H}_{3}+boldsymbol{X} . ) Compound ( mathbf{X} ) is:
A. ( N a H_{2} P O_{2} )
в. ( N a_{2} H P O_{4} )
c. ( N a_{2} C O_{3} )
D. ( operatorname{NaH} mathrm{CO}_{3} )
12
319 Among the following compounds, the one which does NOT produce nitrogen gas upon heating is?
A ( cdotleft(N H_{4}right)_{2} C r_{2} O_{7} )
в. ( operatorname{NaN}_{3} )
( mathbf{c} cdot N H_{4} N O_{2} )
D. ( left(N H_{4}right)_{2}left(C_{2} O_{4}right) )
12
320 ( boldsymbol{S} boldsymbol{O}_{2} ) behaves as a reducing agent
when :
A. Passed over hot ( C u O )
B. Mixed with moist ( H_{2} S )
c. Passes through acidified ( K M n O_{4} ) solution
D. Passed through ( F e S O_{4} ) solution.
12
321 The most acidic is:
A. ( A s_{2} O_{3} )
в. ( P_{2} O_{3} )
( mathrm{c} cdot mathrm{Sb}_{2} mathrm{O}_{3} )
D. ( B i_{2} O_{3} )
12
322 Which of the following statements are true about quartz?
A. it is pure crystalline form of silica.
B. it is a tetrahedral polymer of ( boldsymbol{S} boldsymbol{i} boldsymbol{O}_{boldsymbol{2}} )
C. UV light can pass through quartz
A. A and B are correct
B. B and C are correct
c. A and C are correct
D. all are correct
11
323 Explain why interhalogen compounds are more reactive than their constituent
elements?
12
324 Which of the following is weakest lewis acid?
A ( cdot B C l_{3} )
в. ( A l C l_{3} )
( mathbf{c} cdot G a C l_{3} )
D. ( operatorname{InCl}_{3} )
11
325 Why do noble gases have comparatively
large atomic sizes?
12
326 Yellow oils of sulphur is/are:
A ( . H_{2} S )
в. ( H_{2} S_{2} )
( mathrm{c} cdot mathrm{H}_{2} mathrm{SO}_{4} )
D. ( C S_{2}, N H_{2} C S N H_{2} )
12
327 Q12. Explain the difference in properties of diamond and graphite on the basis of their structures.
Since diamond ich hodin n
:
the hardest onhstance
Ang
11
328 The most acidic oxide among the following is:
A. ( C l_{2} O_{5} )
в. ( C l_{2} O )
( mathbf{c} cdot C l_{2} O_{3} )
D. ( C l_{2} O_{7} )
12
329 State True or False.
Bleaching action of ( S O_{2} ) is due to
reduction and it is temporary.
A. True
B. False
12
330 Starting with elemental phosphorus, ( boldsymbol{P}_{4} )
phosphoric acid can be prepared as
shown ( boldsymbol{P}_{4}(s)+mathbf{5} O_{2}(boldsymbol{g}) longrightarrow boldsymbol{P}_{4} boldsymbol{O}_{10}(s) stackrel{boldsymbol{H}_{2} O}{longrightarrow} )
( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{4} )
A. True
B. False
12
331 Xenon fluoride act as fluoride acceptor
with :
A. ( R b F )
в. ( C s F )
c. Both (A) and (B)
D. None of these
12
332 Assertion
( N O_{2} ) is reddish brown and its dimer
( N_{2} O_{4} ) is colourless
Reason
There is a dative bond formation
between two ( N O_{2} ) molecules.
A. Both assertion and reason are CORRECT and reason is the CORRECT explanation of the assertion
B. Both assertion and reason are CORRECT, but reason is NOT THE CORRECT explanation of the assertion
c. Assertion is CORRECT, but reason is INCORRECT
D. Assertion is INCORRECT, but reason is CORRECT
12
333 Kieselguhr contains:
A. carbon
B. silicon
c. boron
D. iodine
11
334 The weakest ( C l-O ) bond is found in :
A. ( C l O_{4}^{-} )
B. ( C l O_{2}^{-} )
c. ( C l O^{-} )
D. ( C l O_{3}^{-} )
12
335 Atomicity of white or yellow phosphorus
is 4 and it is represented as ( P_{4} ) molecule,calculate the value of
expression ( frac{x cdot y}{z} ) regarding this
molecule.
Where ( x: ) Total number of vertex angles
in ( P_{4} ) molecule
y: Total number of lone pairs in ( P_{4} ) molecule
z: Total number of P- – -P bonds in
( P_{4} ) molecule
12
336 10. Which of the following is gas to room temperature?
(a) Water
(b) Carbon dioxide
(c) Dryice
(d) Nitrogen
11
337 The explosive compound of ( N_{2} ) is:
A. ( N_{2} O_{5} )
в. ( N H_{3} )
c. ( N F_{3} )
D. ( N C l_{3} )
12
338 (a) Complete the following chemical equations:
(i) ( underset{(text {hot and conc.})}{N a O H}+C l_{2} rightarrow )
(ii) ( boldsymbol{X}_{e} boldsymbol{F}_{4}+boldsymbol{O}_{2} boldsymbol{F}_{2} rightarrow )
(b) Draw the structures of the following molecules:
(i) ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{2} )
(ii) ( boldsymbol{H}_{2} boldsymbol{S}_{2} boldsymbol{O}_{7} )
(iii) ( boldsymbol{X} boldsymbol{e} boldsymbol{O} boldsymbol{F}_{4} )
12
339 In which of the following, the double
bond consists of both ( p i ) bond?
( A cdot O_{2} )
в. ( C_{2} )
c. ( B e_{2} )
D. ( S_{2} )
12
340 Consider the following compounds.
( (i) I C I(i i) I B r(i i i) I C I_{3}(i v) S F_{4} )
( (v) B r F_{3}(v i) I F_{3}(v i i) B r F_{5}(v i i i) I F_{7} )
Calculate the value of ( left[frac{boldsymbol{P}^{2}-boldsymbol{Q}^{2}}{boldsymbol{R}+boldsymbol{S}}right] )
Here,
( boldsymbol{P}: ) Total number of polar compounds
( Q: ) Total number of planar compounds
( R: ) Total number of non polar compounds
( boldsymbol{S}: ) Total number of non planar compounds
A. 6
B. 7
( c cdot 4 )
D.
12
341 Oxygen can be prepared by heating
A. potassium permanganate
B. methane
c. carbon
D. none of these
12
342 Explain two properties of carbon:
(i) Catenation
(ii) Tetravalency
11
343 Which of the following are basic oxides?
( M n_{2} O_{7}, V_{2} O_{3}, V_{2} O_{5}, C r_{2} O_{3}, C r O )
A. ( M n_{2} O_{7} ) and ( V_{2} O_{3} )
B. ( V_{2} O_{3} ) and ( C r O )
c. ( C r O ) and ( C r_{2} O_{3} )
D. ( V_{2} O_{5} ) and ( V_{2} O_{3} )
12
344 Tin reacts with concentrated ( H N O_{3} ) to
give:
A. stannic nitrate
B. stannous nitrate
c. metastanic acid
D. none of these
12
345 How many allotropes do sulphur have?
A .4
B. 20
( c cdot>20 )
D. 10
12
346 Which of the following xenon compounds may not be obtained by hydrolysis of xenon fluorides?
A. ( X e O_{2} F_{2} )
в. ( X e O F_{4} )
( mathbf{c} cdot X e O_{3} )
D. ( X e O_{4} )
12
347 Write the name and structure of any five
oxy acids of phosphorus?
12
348 When sulphur is reacted with ozone in
water,the product formed is:
A ( . H_{2} )
в. ( H_{2} S O_{3} )
( mathrm{c} cdot mathrm{H}_{2} mathrm{SO}_{4} )
D. ( H_{2} S_{2} O_{8} )
12
349 29. Which of the following ele.
ments is obtained from se
weeds ?
(1) Iodine (2) Vanadium
(3) Argon (4) Sulphur
12
350 What is the basicity of orthophosphorous acid?
A. one
B. Two
c. Three
D. Four
12
351 White phosphorus reacts with caustic
soda. The products are ( P H_{3} ) and
( N a H_{2} P O_{2} . ) This reaction is an example
of
A. oxidation
B. reduction
c. neutralization
D. disproportionation
12
352 When chlorine water is exposed to
sunlight ( O_{2} ) is liberated. Hence:
A. hydrogen has little affinity to ( O_{2} )
B. hydrogen has more affinity to ( O_{2} )
C. hydrogen has more affinity to ( C l_{2} )
D. it is a reducing agent
12
353 Sulphur combines with oxygen in the ratio 2: 3 to form the oxides of sulphur
Find the formula of its oxide.
12
354 Which of the following compounds do
not exist?
( N_{4}, P_{4}, P C I_{5}, N C I_{5}, P_{2} O_{5}, N O_{2}, P O_{2} )
A. ( N_{4}, N C I_{5}, N O_{2} )
B. ( N_{4}, N C I_{5}, P O_{2} )
c. ( P C I_{5}, N C I_{5}, P O_{2} )
D. All of these
12
355 (a) Draw the structures of the following molecules:
(i) ( N_{2} O_{5} )
(ii) ( boldsymbol{H} boldsymbol{C l O}_{4} )
(b) Explain the following observations:
(i) ( H_{2} S ) is more acidic than ( H_{2} O )
(ii) Fluorine does not exhibit any
positive oxidation state.
(iii) Helium forms no real chemical
compound.
12
356 Give the balanced reaction for the
manufacture of the ammonia gas.
A. ( 3 N_{2}+3 H_{2} rightarrow 6 N H_{3} )
в. ( N_{2}+3 H_{2} rightarrow 2 N H_{3} )
c. ( N_{2}+3 H_{2} rightarrow N H_{3} )
D. ( N_{2}+6 H_{2} rightarrow 4 N H_{3} )
12
357 Which of the following will not be
oxidised by ( mathrm{O}_{3} ? )
A . KI
в. ( mathrm{FeSO}_{4} )
( c cdot ) кмпО
D. ( mathrm{K}_{2} mathrm{Mn} mathrm{O}_{4} )
12
358 Among ( V_{2} O_{5} ) and ( P t, ) which is a better
catalyst for formation of ( S O_{3} ) from ( S O_{2} )
by contact process? Why?
12
359 Nitrogen is a poisonous gas because animals die in their presence why? 12
360 The shape of ( C l F_{3} ) molecule is:
A . tetrahedral
в. T shape
c. linear
D. trigonal
12
361 Which of the following equations is not
shown by the appropriate halogen?
( mathbf{A} cdot F_{2}+2 O H^{-} )solution( rightarrow 2 F^{-}+H_{2} O+O F_{2} )
B ( cdot 2 F_{2}+4 O H^{-} ) conc ( stackrel{text {hot}}{longrightarrow} 4 F^{-}+2 H_{2} O+O_{2} )
( mathbf{c} cdot X_{2}+2 O H^{-} operatorname{conc} stackrel{text {hot}}{longrightarrow} H_{2} O+X^{-}+X O^{-} ) where ( X ) is ( mathrm{Cl} )
Br and
( mathbf{D} cdot X e F_{4} )
12
362 11. 2.84 g of P,019 is dissolved in 1 L aqueous solution.
Thus,
(a) resulting solution is 0.01 M
(b) it is neutralized to Na PO, by 400 mL of 0.3 M NaOH
(c) it is neutralized to CaHPO, by 400 mL of 0.1 M
Ca(OH),
(d) it cannot be neutralized by basic solution
11
363 Which have a giant covalent structure?
This question has multiple correct options
A. Diamond
в. ( operatorname{si} O_{2} )
c. ( operatorname{sicl}_{4} )
( D cdot C O_{2} )
11
364 Assertion
Conc. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) as a drying agent.
Reason
HCl prepared from NaCl is dried by passing through conc.sulphuric acid.
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
365 Elements with atomic numbers 9,17,35
53 are collectively known as:
A. chalcogens
B. halogens
c. lanthanides
D. rare gases
12
366 When conc. ( boldsymbol{H} boldsymbol{N} boldsymbol{O}_{3} ) is heated, it
decomposes to give-
A. ( O_{2} ) and ( N_{2} )
B. NO
c. ( N_{2} O_{5} )
D. ( N O_{2} ) and ( O_{2} )
12
367 Which oxide does not act as a reducing
agent? This question has multiple correct options
A . ( N O )
в. ( N O_{2} )
( mathrm{c} cdot mathrm{N}_{2} mathrm{O} )
D. ( N_{2} O_{5} )
12
368 Which is the anhydride of orthosilicic
acid?
( A cdot s i )
B. Sio
( mathrm{c} cdot operatorname{si0}_{2} )
D. ( operatorname{si} 0_{3} )
11
369 “Aqua regia” is a combination of :
A. ( H C l ) and ( H_{2} S O_{4} )
B. ( H C l ) and ( H N O_{3} )
c. ( H C l ) and ( H B r )
D. HCl and ( H F )
12
370 The basicity is high for :
A. Phosphorus acid
B. Metaphosphoric acid
c. ortho phosphoric acid
D. Hypo phosphorus acid
12
371 Assertion
( boldsymbol{P C l}_{5} ) and ( boldsymbol{P C l}_{4} ) are thermally unstable
Reason
They produce same gas on thermal
decomposition
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
372 es Question 1. Why are pentahalides more covalent than trihalides?
Covalent character increases with increase in oxidation state.
12
373 H ( C l ) gas can fume in moist air
A. True
B. False
12
374 How are interhalogen compounds formed? What general compositions can be assigned to them? 12
375 ( mid=H e )
( |=N e quad| I=A r quad I V=K r )
Decreasing order of melting point of compound I-IV follows:
B. |> || > || > > IV
c. ॥> ||| > |V>1
D. II>IV>III>1
12
376 HCOOH reacts with conc. ( H_{2} S O_{4} ) to
produce
A. ( c o )
в. ( C O_{2} )
c. No
D. ( N O_{2} )
12
377 How many following oxyacids have peroxy linkage? ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{3}, boldsymbol{H}_{2} boldsymbol{S}_{2} boldsymbol{O}_{8}, boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{2}, boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{5}, boldsymbol{H} boldsymbol{l} boldsymbol{l} ) 12
378 When conc. ( H_{2} S O_{4} ) is added to hydrated copper [ll] sulphate:
A. white crystals is changed to black powder as water is removed.
B. brown crystals is changed to black powder as water is removed.
c. black crystals is changed to white powder as water is removed.
D. blue crystals is changed to white powder as water is removed
12
379 Q2. How is boron obtained from borax? Give chemical equations with reaction conditions. 11
380 Phosphoric acid is highly soluble in :
A . oil
B. Ammonia solution
c. water
D. Benzene
12
381 Give two uses of sulphur dioxide. 12
382 54 Nitric acid forms an oxide of nitrogen on reaction with P,00. Write the
reaction involved. Also write the resonating structures of the oxide of
nitrogen formed.
12
383 Select incorrect statement about ( N_{2} O_{4} )
( therefore )
A. It self ionises as ( N O^{+}, N O_{3}^{-} )
B. Substance containing ( N O^{+} ) is said to be acid and that
containing ( N O_{3}^{-} ) is said to be base
( mathrm{C} cdot mathrm{N}_{2} mathrm{O}_{4} ) is paramagnetic
D. ( N O_{2} ) dimerises to ( N_{2} O_{4} ) with disappearance in paramagnetism
12
384 A sulphate of a metal (A) on heating evolves two gases ( (mathrm{B}) ) and ( (mathrm{C}) ) and an
oxide (D). Gas (B) turns ( K_{2} C r_{2} O_{7} ) paper
green while gas (C) forms a trimer in which there is no ( S-S ) bond.

Compound (D) with ( H C l ), forms a lewis
acid (E) which exists as a dimer.

Compounds ( (A),(B),(C),(D) ) and ( (E) ) are
respectively:
A ( cdot ) FeSO( _{4}, S O_{2}, S O_{3}, F e_{2} O_{3}, F e C l_{3} )
в. ( A l_{2}left(S O_{4}right)_{3}, S O_{2}, S O_{3}, A l_{2} O_{3}, F e C l_{3} )
c. FeS( , S O_{2}, S O_{3}, ) FeSO( _{4}, ) FeCl( _{1} )
D. FeS, ( S O_{2}, S O_{3}, F e_{2}left(P O_{4}right)_{3}, F e C l_{2} )

12
385 An example of dibasic acid is:
A. orthophosphorus acid
B. orthophosphoric acid
c. hypophosphorus acid
D. pyrophosphoric acid
12
386 Select correct statement(s):
This question has multiple correct options
A. In ( alpha ) -graphite, the layers are arranged in the sequence ( A B A B )
B. ( ln beta ) -graphite, the layers are arranged in the sequence ( A B C A B C )
C. In ( alpha ) -graphite, the layers are arranged in the sequence ( A B C A B C )
D. ( ln beta ) -graphite, the layers are arranged in the sequence ( A B A B )
11
387 The correct sequence of match for List-
from List-II is:
( begin{array}{ll}text { List-I } & text { List-II } \ A) mathrm{O}_{2} & 1 text { ) Monoatomic } \ B text { Po } & 2 text { ) Bent molecule } \ C / mathrm{S}_{8} & text { 3) Paramagnetic } \ D) mathrm{O}_{3} & text { 4) Puckered ring }end{array} )
B. A-3, B-1, C-4, D-2
c. ( A-4, B-2, C-3, D-1 )
D. A-2, B-4, C-1, D-3
12
388 In the oxidation of ( N_{2} H_{4} ) to ( N_{2} )
equivalent weight of ( N_{2} H_{4} ) would be
12
389 ( boldsymbol{S O}_{2} ) bleaches by
A. reduction
B. oxidation
C. ionisation
D. hydration
12
390 Assertion
On cooling, the brown colour of nitrogen dioxide disappears.
Reason
On cooling, ( N O_{2} ) undergoes dimerisation resulting in the pairing of
odd electrons of ( N O_{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
391 What is the basicity of ( boldsymbol{H}_{4} boldsymbol{P}_{2} boldsymbol{O}_{7} ) ?
( mathbf{A} cdot mathbf{1} )
B. 2
( c cdot 3 )
D. 4
12
392 Which of the following acids is
produced by treating ( boldsymbol{K} boldsymbol{N} boldsymbol{O}_{3} ) with
( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} ) under suitable experimental
conditions?
A. ( H N O_{2} )
в. ( H_{2} S O_{3} )
c. ( H N O_{3} )
D. ( H_{2} S_{2} O_{7} )
12
393 Maximum covalency shown by sulphur is:
A .2
B. 4
( c .6 )
D. none
11
394 Sodium thiosulphate is used in:
A. photography
B. medicines
c. explosive industry
D. match industry
12
395 The catenation tendency of ( C, ) Si and
Ge is in the order ( G e<S i<C ). The
bond energies ( left(text { in } k J m o l^{-1}right) ) of ( C- )
( C, S i-S i ) and ( G e-G e ) bonds
respectively are:
A. 348,167,180
B. 348,180,167
c. 167,180,348
D. 180,167,348
11
396 The oxidation state of sulphur in the
anions ( S O_{3}^{2-}, S_{2} O_{4}^{2-} ) and ( S_{2} O_{6}^{2-} ) follows the order:
A ( cdot S_{2} O_{6}^{2-}<S_{2} O_{4}^{2-}<S O_{3}^{2} )
B. ( S O_{3}^{2-}<S_{2} O_{4}^{2-}<S_{2} O_{6}^{2} )
c. ( S_{2} O_{4}^{2-}<S O_{3}^{2-}<S_{2} O_{6}^{2-} )
D. ( S_{2} O_{4}^{2-}<S_{2} O_{6}^{2-}<S O_{3}^{2} )
12
397 What is the action of chlorine on Excess
( N H_{3} )
12
398 Quartz is a crystalline variety of :
A . Silicon carbide
B. Sodium silicate
c. silica
D. silicon
11
399 ( N H_{3}+H_{2} O longrightarrow(C)+(D)( ) both oxy
acid)
A ( cdot(c): H N O_{2} ; quad(D): H N O_{2} )
B ( cdot(mathrm{C}): H_{2} N O_{3} ; quad ) (D) ( : H N O_{3} )
C ( cdot(mathrm{C}): H N O_{2} ; quad(mathrm{D}): H N O_{3} )
D. None of these
12
400 Which of the following compounds is
amphoteric?
( mathbf{A} cdot operatorname{Cr}(O H)_{2} )
B. ( F e(O H)_{2} )
( mathbf{c} cdot operatorname{Cr}(O H)_{3} )
D. ( mathrm{Fe}(mathrm{OH})_{3} )
12
401 How many ( mathrm{P}-mathrm{H} ) bonds are there in
( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{2} ? )
12
402 Which of the following travels to different part of body through blood stream and provides oxygen?
A. Haemoglobin
B. Oxyhaemoglobin
c. carboxyhaemoglobin
D. none of these
11
403 The oxide that ( operatorname{gives} H_{2} O_{2} ) on treatment with a dilute acid is :
A ( cdot P b O_{2} )
в. ( N a_{2} O_{2} )
( mathrm{c} cdot M n O_{2} )
D. ( B a O_{2} )
12
404 On heating with concentrated ( N a O H )
solution in an inert atmosphere of ( boldsymbol{C O}_{2} )
white phosphorous gives a gas.Which of the following statement is incorrect
about the gas?
A . It is less basic than ( N H_{3} )
B. It is more basic than ( N H_{3} )
c. It is highly poisonous and has smell like rotten fish
D. It’s solution in water decomposes in the presence of light
12
405 ( P C l_{3} ) is a precursor to which type of chemical compounds?
A. organophosphorus compounds
B. Organonitrogen compounds
c. organolithium compounds
D. Organo compounds
12
406 Draw structure and write geometry of
( boldsymbol{P C l}_{3} ) and ( boldsymbol{P C l}_{5} )
12
407 Consider following scheme involving oxides and oxy-acids of nitrogen. Out of the following which reactions are
disproportionations?

This question has multiple correct options
A . 2, 10
в. 2,
( c cdot 1,1 )
D. 13,14

12
408 Gases: ammonia, chlorine, hydrogen
chloride and sulphur dioxide
Select the gas that matches the description given.
Statement : The gas turns moist red litmus paper blue.
A. Chlorine
B. Ammonia
c. Sulphur dioxide
D. Hydrogen chloride
12
409 Blasting of TNT is done by mixing it with:
A . ( mathrm{NH}_{4} mathrm{Cl} )
в. ( mathrm{NH}_{4} mathrm{NO}_{3} )
c. ( mathrm{NH}_{4} mathrm{NO}_{2} )
D. ( left(mathrm{NH}_{4}right)_{2} mathrm{SO}_{4} )
12
410 Which of the following statement is
true?
A . Cold and very diluted ( H N O_{3} ) forms ( N H_{4} N O_{3} ) with ( Z n ) or ( S n )
B. Concentrated ( H N O_{3} ) forms ( H_{2} S n O_{3} ) with ( S n )
C . Cold and concentrated ( H N O_{3} ) forms ( N O_{2} ) with ( C u )
D. All the above statements are correct
12
411 The oxidation state of ( S ) in ( N a_{2} S_{4} O_{6} ) is:
A . +2.5
B. +2 and +3 (two ( S ) have +2 and two ( S ) have +3 )
( mathrm{c} cdot+2 ) and +3 (three ( S ) have +2 and one ( S ) has +3
D. +5 and 0 (two ( S ) have +5 and the other two ( S ) have 0 )
12
412 Pyrophosphorous acid has the molecular formula:
A. ( H_{3} P O_{3} )
в. ( H_{3} P O_{4} )
c. ( H_{4} P_{2} O_{5} )
D. ( H_{4} P_{2} O_{7} )
12
413 Select the correct statement from
following.
A. Between ( N H_{3} ) and ( P H_{3}, N H_{3} ) is a better electron donor
because the lone pair of electrons occupies spherical s-orbital and is less directional
B. Between ( N H_{3} ) and ( P H_{3}, P H_{3} ) is a better electron donor because the lone pair of electrons occupies spherical ( s p^{3} ) orbital and is less directional
C. Between ( N H_{3} ) and ( P H_{3}, N H_{3} ) is a better electron donor because the lone pair of electrons occupies spherical ( s p^{3} ) orbital and is less directional
D. Between ( N H_{3} ) and ( P H_{3}, P H_{3} ) is a better electron donor because the lone pair of electrons occupies spherical s-orbital and is less directional
12
414 A bottle of liquor ammonia should be
cooled before opening.
A. True
B. false
c. sometimes true sometimes false
D. none
12
415 Nitrogen liberated by the thermal decomposition of only:
A. ( mathrm{NH}_{4} mathrm{NO}_{2} )
B. ( mathrm{NaN}_{3} )
( mathrm{c} cdotleft(mathrm{NH}_{4}right)_{2} mathrm{Cr}_{2} mathrm{O}_{7} )
D. all the three
12
416 Pressure is increased in the Haber
process for making ammonia. It favors:
A. the reverse reaction
B. the forward reaction
c. neither reaction
D. none
12
417 The increasing order of volatility of
hydrides of the group 16 elements is :
A. ( H_{2} S<H_{2} O<H_{2} S e<H_{2} T e )
в. ( H_{2} O<H_{2} T e<H_{2} S e<H_{2} S )
c. ( H_{2} O<H_{2} S<H_{2} S e<H_{2} T e )
D. none of these
12
418 Laughing gas is prepared by heating:
A. ( N H_{4} C l+N a N O_{3} )
в. ( N H_{4} C l )
c. ( left(N H_{4}right)_{2} S O_{2} )
D. ( N H_{4} N O_{3} )
12
419 Chlorine was discovered by:
A. Priestley
B. Davy
c. scheele
D. Cavendish
12
420 Phosphine is not evloved when:
A. White phosphorus is boiled with a strong
solution of
( mathrm{Ba}(mathrm{OH})_{2} )
B. Phosphorus acid is heated
C. Calcium hypophosphite is heated
D. Metaphosphoric acid is heated
12
421 Mustard gas is represented by formula:
A ( cdot C H_{2} C l_{2} )
в. ( C_{4} H_{8} C l_{2} S )
c. ( C_{2} H_{2} )
D. ( C C l_{3} N O_{3} )
12
422 Soluble wompe
Q. 58 Phosphorus forms a number of oxoacids. Out of these oxoacids,
phosphinic acid has strong reducing property. Write its structure and
also write a reaction showing its reducing behaviour.
uning nronerty
12
423 Fill in the blanks.
Plastic sulphur is of
( boldsymbol{S}_{8} ) molecule
12
424 Identify the balanced chemical reaction
of chlorine with respect to reactant ( D )
A ( cdot F e+C l_{2} rightarrow F e C l_{3} )
в. ( 2 F e+3 C l_{2} rightarrow 2 F e C l_{3} )
( mathrm{c} cdot 2 mathrm{Fe}+6 mathrm{Cl}_{2} rightarrow 2 mathrm{FeCl} )
D. ( F e+C l_{2} longrightarrow F e C l_{3}+F e C l_{2} )
12
425 ( X e F_{6} ) exists as ( left[X e F_{4}right]^{+2}left[2 H F_{2}right]^{-} ) in
( boldsymbol{H} boldsymbol{F} )
A. True
B. False
12
426 Identify the compound ‘X’ :
A. Magnesium Nitride
B. Calcium nitride
C . Nitrolim
D. Sodium nitride
12
427 The gas which is supposed to be acidic
anhydride :
A ( cdot N O_{2} )
в. ( C O )
( c cdot N_{2} O )
D. ( N O )
12
428 The first noble gas compound prepared by Bartlett is :
A ( cdot mathrm{xeF}_{2} )
в. КrF ( _{2} )
c. ( mathrm{xePtF}_{6} )
D. ( mathrm{xeO}_{3} )
12
429 Which of the following electronic configuration corresponds to an inert gas?
A ( cdot 1 s^{1} 2 s^{2} 2 p^{5} )
B ( cdot 1 s^{2} 2 s^{2} 2 p^{6} )
( mathbf{c} cdot 1 s^{2} 2 s )
D. ( 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1} )
12
430 R. 2 Which of the following is a Lewis acid?
(a) AICI
(b) MgCl2 (c) CaCl2
(d) BaCl2
11
431 Which of the following is/are correct for
group 14 elements?
This question has multiple correct options
A. The stability of dihalide is in the order of ( P b X_{2}> )
( operatorname{Sn} X_{2}>operatorname{Ge} X_{2}>operatorname{Si} X_{2}>C X_{2} )
B. the ability to form ( p Pi-p Pi ) multiple bonds among
themselves increases down the group
C. the tendency for catenation decreases down the group
D. they all from oxides with the formula MO
11
432 Consider the following properties of the
noble gases:
I: they readily from compounds
which are colourless.
II : they generally do not form ionic
compounds. III : they have variable oxidation states
in their compounds. ( I V: ) they generally do not form covalent compounds.
Select the the correct properties.
A. ( I, I I ) and ( I I I ) only
B. II and III only
C. ( I ) and ( I I I ) only
D. I only
12
433 Oxidation state of +1 for phosphorous is
found in :
A ( . mathrm{H}_{3} mathrm{PO}_{3} )
в. ( mathrm{H}_{3} mathrm{PO}_{4} )
( mathrm{c} cdot mathrm{H}_{3} mathrm{PO}_{2} )
D. ( mathrm{H}_{4} mathrm{P}_{2} mathrm{O}_{7} )
12
434 Why fluorine is a stronger oxidizing agent than chlorine? 12
435 Question 10. In the ring text of NO3 ion, Fetion reduces nitrate ion to
nitric oxide, which combines with Fe2+ (aq) ion to form brown complex.
12
436 The oxidation states of ( S ) atom in
( S_{4} O_{6}^{2-} ) from left to right respectively are
( mathbf{A} cdot+6,0,0,+6 )
В. +3,+1,+1,+3
c. +5,0,0,+5
( mathbf{D} cdot+4,+1,+1,+4 )
12
437 How many of the following is/are not obtained as one of the hydrolysis
products of ( X e F_{2} ) with water?
( boldsymbol{X} boldsymbol{e} boldsymbol{O}_{3}, boldsymbol{X} boldsymbol{e}, boldsymbol{H} boldsymbol{F}, boldsymbol{O}_{2} )
A.
B. 3
( c cdot 4 )
D.
12
438 In presence of moisture ( boldsymbol{H}_{2} boldsymbol{S} ) can:
A. act as oxidant
B. lose electron
c. gain electron
D. none of these
12
439 The hybrid orbitals used by Phosphorus
n the formation of ( mathbf{P C l}_{5} ) are :
( A cdot s p^{3} )
B ( cdot operatorname{sp}^{2} )
c. ( d s p^{2} )
( D cdot s p^{3} d )
12
440 The oxide of chlorine having the maximum oxidizing power is :
A. ( C l_{2} O_{7} )
в. ( C l_{2} O_{6} )
c. ( C l_{2} O )
D. ( C l O_{2} )
12
441 Due to the nature of catenation, carbon
can form:
A. Open chain compounds as well as branched chain compounds.
B. Open chain compounds as well as closed chain compounds.
C. Both ( A ) and ( B ) are correct
D. None of these.
11
442 ( boldsymbol{A l}+boldsymbol{X} stackrel{Delta}{rightarrow} boldsymbol{Y} stackrel{boldsymbol{H}_{2} boldsymbol{O}}{rightarrow} boldsymbol{Z}+boldsymbol{N} boldsymbol{H}_{3} )
Here ( boldsymbol{X}, boldsymbol{Y} ) and ( boldsymbol{Z} ) are respectively:
( mathbf{A} cdot O_{2}, A l_{2} O_{3}, A l(O H)_{3} )
в. ( N_{2}, ) АlN, ( A l_{2} O_{3} )
c. ( N_{2}, ) AlN, ( A l(O H)_{3} )
D. ( C O_{2}, A l_{4} C_{3}, C H_{4} )
12
443 Which element does not show allotropy?
( A cdot P b )
B. si
( c cdot c )
D. sn
11
444 Assertion
Borax bead test is applicable only to coloured salts.
Reason
In borax bead test, coloured salts are
decomposed to give coloured metal
metaborates.
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
11
445 ( H_{2} O_{2} ) is a:
A. monobasic acid
B. dibasic acid
C. neutral compound
D. weak alkali
11
446 Q33. An aqueous solution of borax is
(a) neutral (b) amphoteric (c) basic (d) acidic
11
447 Write a balanced equation for each of the following observations:
( H N O_{3} ) turns brown when exposed to
air.
A ( cdot 2 H N O_{3} longrightarrow H_{2} O+2 N O+3(O), 2 N O+O_{2} rightarrow )
( 2 N O_{2} )
в. ( 2 H N O_{3} rightarrow H_{2} O+2 N O+2(O), 2 N O+O_{2} rightarrow )
( 2 N O_{2} )
c. ( 2 H N O_{3} longrightarrow H_{2} O+N O+3(O), N O+O_{2} longrightarrow 2 N O_{2} )
D. ( 2 H N O_{3} rightarrow H O+2 N O_{2}+3(O), 2 N O_{2}+O_{2} longrightarrow )
( 2 N O_{2} )
12
448 When burning potassium is brought in
( boldsymbol{S O}_{2} ) then:
This question has multiple correct options
A. it stop burning.
B. it forms potassium thiosulphate.
c. it forms potassium sulphite.
D. sulphur is obtained as product
12
449 Assertion
( K, R b ) and ( C s ) form superoxides.
Reason
The stability of the superxides
increases from ‘ ( K^{prime} ) to ( ^{prime} C s^{prime} ) due to
decrease in lattice energy.
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
450 The catalyst used in laboratory
preparation of oxygen is:
A. ( M g O )
в. ( M n O_{2} )
( c cdot P t )
D. ( F e )
12
451 Which of the following statements
is/are correct?
This question has multiple correct options
A. The bleaching action of chlorine is due to oxidation and so permanent, while the bleaching action of sulphurdioxide is due to reduction and so temporary.
B. ( H I ) cannot be prepared by heating an ionic iodide with conc. ( H_{2} S O_{4}, ) but ( H C l ) can be prepared by the same
way.
C. The oxidising power of halogens follow the order:
( C l_{2}>F_{2}>B r_{2}>I_{2} )
D. On reaction of ( X e F_{2} ) with water, no redox change
takes place.
12
452 Hybridization on carbon atoms in
diamond is :
( A cdot s p )
B ( cdot s p^{2} )
( c cdot s p^{3} )
D. ( s p^{3} d )
11
453 Nitric oxide is formed by the reaction of:
A ( cdot C+N_{2} O )
в. ( C u+H N O_{3} )
c. ( C u+N_{2} O )
D. ( C u+N O_{2} )
12
454 With reference to Haber’s process, write
the equation and the conditions
required.
12
455 More than four bonds are made by how many elements in carbon family?
A .
B. 2
( c .3 )
D. 4
E. 5
11
456 Q. 19 The oxidation state of central atom in the anion of comp
of central atom in the anion of compound NaH PO,
will be …
(a) + 3
(b) + 5
(c) + 1
(d) – 3
Q.10 The orication state of content arom in the aion of compound Nation
Ans.
12
457 Assertion
Statement -1: White phosphorus is
less stable where as red phosphorus is
more stable.
Reason
Statement -2: White phosphorus exist
as individual ( P_{4} ) having more strained
geometery while red phosphorus has ( boldsymbol{P}_{mathbf{4}} ) tetrahedron structure linked together.
A. Statement – 1 is true, Statement – 2 is true and Statement – 2 is correct explanation for Statement –
1.
B. Statement – 1 is true, Statement – 2 is true and Statement – 2 is NOT the correct explanation for Statement – 1
c. Statement -1 is true, Statement -2 is false
D. Statement – 1 is false, Statement – 2 is true
12
458 Why is argon used in lamps?
A. Argon forms molecules when electricity is passed through it
B. Argon is inert and so does not react with the hot filament
C. Argon is less dense than air
D. Argon produces light when it burns
12
459 Commercial nitrogen is passed through copper chips kept in ammonia solution for removing oxygen.Why? 12
460 Which of the following is not suitable for use in dasiccator to dry substance?
A . conc. ( H_{2} S O_{4} )
в. ( N a_{2} S O_{4} )
c. ( C a C l_{2} )
D. ( P_{4} O_{10} )
12
461 What the covalency of phosphorous atom in excited state?
( A cdot 3 )
B. 4
( c cdot 5 )
( D )
11
462 In which one of the following compounds, the oxidation number of sulphur is the least
( A cdot S O_{2} )
в. ( S O_{3} )
( mathbf{c} cdot N a_{2} S O_{4} )
D. ( H_{2} S O_{4} )
12
463 Assertion
White phosphorus is more reactive than
red phosphorus.
Reason
Red phosphorus contains tetrahedral units linked to one another to form
linear chains.
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
464 How many ( S-O-S ) linkage(s) is/are
present in ( boldsymbol{H}_{2} boldsymbol{S}_{3} boldsymbol{O}_{6} ? )
12
465 When copper is reacted with conc.
sulphuric acid, which gas is evolved?
A. ( H_{2} )
в. ( O_{2} )
( c cdot S O_{2} )
D. ( S O_{3} )
12
466 The atomic weight of noble gases is obtained by using the relationship:
A. Atomic weight = equivalent weight ( x ) valency
B. Atomic weight = equivalent weight/valency
C. At. weight = valency/equivalent weight
D. 2 x V.D. = molecular weight = atomic weight
12
467 The valencies of p block elements are
equal to group number or 8 minus the group number. Therefore they show one
lower valency and one higher valency. However, if we go to the bottom elements of any group, the compounds with lower valency are predominant whereas higher valency becomes rather
uncommon. Explain.
11
468 Which of the following oxides is amphoteric in character?
A. ( C a O )
в. ( C O_{2} )
( mathrm{c} cdot operatorname{si} 0_{2} )
D. ( operatorname{sn} O_{2} )
12
469 The reaction of slaked lime with ( C l_{2} ) gas
gives:
A. only ( C a O C l_{2} )
B. only ( C a C l_{2} )
C. a mixture of ( C a(O C l)_{2}, C a(O H)_{2}, C a C l_{2} ) and ( H_{2} O )
D. quick lime
12
470 ( boldsymbol{S} boldsymbol{F}_{4} stackrel{text {hydrolysis}}{boldsymbol{X}}+boldsymbol{Y} )
( boldsymbol{X}+boldsymbol{H}_{2} boldsymbol{S} rightarrow boldsymbol{Z} )
Here, ( Z ) is :
( A cdot S O_{3} )
B. colloidal sulphur
c. gaseous sulphur
D. solid sulphur
12
471 Match the following
Set- Set – II
A) ( F_{2} )
1) pale yellow colour gas
B) ( C l_{2} )
2) violet colour solid
C) ( B r_{2} )
3) orange liquid
D) ( boldsymbol{I}_{2} )
4) greenish colour gas
Correct the matching is
A . A-1, B-3, C-2, D-4
B. A-1, B-4, C-3, D-2
c. ( A-2, B-3, C-4, D-1 )
D. A-3, B-2, C-1, D-4
12
472 The atomic number of an element ( X ) is
34. Then it is present in period
A. 4th period and IVA group
B. 4 th period and VIA group
c. 4 th period and VIIA group
D. 5th period and VIA group
12
473 The reaction which gives Borazole as a
major product is ?
( mathbf{A} cdot L i H+B_{2} H_{6}^{2 m o l e s L i H_{rightarrow} 1 m o l e B_{2} H_{6}} )
( mathbf{B} cdot B_{2} H_{6}+N H_{3} frac{2 m o l e s B_{2} H_{6} 1 m o l e N H_{3}}{l o w t e m p} )
( mathbf{c} cdot B_{2} H_{6}+N H_{3} frac{1 m o B_{2} H_{6} .2 m o l e s N H_{3}}{l o w t e m p} )
D. ( B_{2} H_{6}+N H_{3} frac{1 m o B_{2} H_{6} .2 text { moles } N H_{3}}{text {hightemp}} )
11
474 Nitrogen is restricted to a maximum
covalency of 4 since only four (one s and three ( p ) ) orbitals are available for
bonding. The heavier elements have vacant d orbitals in the outermost shell
which can be used for bonding (covalency) and hence, expand their
covalence as in ( boldsymbol{P} boldsymbol{F}_{mathbf{6}}^{-} )
12
475 Assertion
( boldsymbol{T} e boldsymbol{B} boldsymbol{r}_{4} ) and ( boldsymbol{P o} boldsymbol{B r}_{4} ) are quite stable
while ( S B r_{4} ) and ( S e B r_{4} ) are unstable
Reason
Inert pair effect is greater in tetra bromides of ( S ) and ( S e ) than in ( T e ) and
Po.
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
476 Assertion
Statement-1: Oxyacids of group VI A
elements : ( boldsymbol{H}_{2} boldsymbol{S O} boldsymbol{4}, boldsymbol{H}_{2} boldsymbol{S} boldsymbol{e} boldsymbol{O}_{4}, boldsymbol{H}_{6} boldsymbol{T} boldsymbol{e} boldsymbol{O}_{6} )
Reason
Statement-2: The lighter member
where ( boldsymbol{O}(boldsymbol{2} boldsymbol{p}) rightarrow boldsymbol{X}(boldsymbol{3} boldsymbol{d}, boldsymbol{4} boldsymbol{d}) boldsymbol{pi} ) bonding
is significant forms strong ( pi- ) bonds
to give ( boldsymbol{X} boldsymbol{O}_{4}^{2-} )
A. Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-
B. Statement-1 is true, statement-2 is true and statement-2 is not the correct explanation for statement-1
c. Statement-1 is true, statement-2 is false.
D. Statement-1 is false, statement-2 is true.
12
477 Formula of oleum is:
( mathbf{A} cdot H_{2} S O_{3} )
( mathbf{B} cdot H_{2} S O_{4} )
( mathbf{c} cdot H_{2} S O_{5} )
D. ( H_{2} S_{2} O_{7} )
12
478 ( S O_{2} ) does not acts as:
A. bleaching agent
B. oxidising agent
c. reducing agent
D. dehydrating agent
12
479 Given are ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{2}, boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{3}, boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{4} ) and
( boldsymbol{H}_{4} boldsymbol{P}_{2} boldsymbol{O}_{7} )
Which of the above oxoacids results
into two series of salts?
A ( . H_{3} P O_{2} )
в. ( H_{3} P O_{3} )
( mathrm{c} . H_{3} P O_{4} )
D. ( H_{4} P_{2} O_{7} )
12
480 Consider the following equilibrium:
( boldsymbol{N} boldsymbol{H}_{3}+boldsymbol{N} boldsymbol{H}_{3} rightleftharpoons boldsymbol{N} boldsymbol{H}_{4}^{+}+boldsymbol{N} boldsymbol{H}_{2}^{-} )
Why ( N H_{3} ) undergo self ionization?
12
481 When fluoride is heated with conc.
( H_{2} S O_{4} ) and ( M n O_{2} ) the gas evolved is
A. ( H F )
в. ( F_{2} )
( mathrm{c} cdot S F_{4} )
D. None
12
482 The reason(s) for small radius of Ga
compared to ( A l ) is/are :
This question has multiple correct options
A. poor screening effect of ( d ) and ( f ) orbitals.
B. increase in nuclear charge
c. presence of higher orbital
D. higher atomic number
11
483 Assertion
Red phosphorus is less reactive than
yellow phosphorus.
Reason
Red phosphorus is insoluble in ( C S_{2} ) whereas white phosphorus is soluble.
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
484 The least abundant element of IV A
group is :
A .
B. si
( c cdot ) Ge
D. Pb
11
485 The solid ( P C l_{5} ) exists as :
A ( cdot P C l_{3} )
B ( cdot P C l_{4}^{+} )
c. ( P C l_{6}^{-} )
D. ( P C l_{4}^{+} ) and ( P C l_{6}^{-} )
12
486 Which of the following is true for diamond?
A. It is a good conductor of electricity
B. It is very soft
c. It is a good conductor of heat
D. It is made up of carbon, hydrogen and oxygen atoms
11
487 Potassium permanganate ( rightarrow )
potassium manganate ( +A+ ) oxygen
What is ( A ) in the given reaction?
A. Manganese
B. Manganese dioxide
c. Manganese trioxide
D. Manganese tetraoxide
12
488 sewage ettluent on the levels of oxygen concentration, bacterial population and
algal growth in a fresh water stream.
The given graph is plotted based on his
findings.
select the correct statement regarding
the given graph.
A. There is a fall in oxygen concentration between point and ( 4 mathrm{km} ) downstream because it is utilized by algae for respiration during day
B. There is a rise in oxygen concentration between ( 4 mathrm{km} ) and ( 8 mathrm{km} ) downstream because of oxygen for respiration is lower
C. Bacterial population never recovers from 8 km onwards because all the oxygen is used by algae
D. There is decrease in the level of bacteria between ( 5 mathrm{km} ) and ( 7 mathrm{km} ) downstream because all the oxygen and organic matter has been used up by algal population
11
489 Question 12. Explain why the acidity of oxo-acids of chlorine increase
in the order given below.
HCIO < HCIO, < HCIO3 < HCIO,
Selection
12
490 Select correct statement(s):
( mathbf{A} cdot O_{3} ) molecule is resonance stabilised.
B. There is 3 -centre, 4 -electron ( pi ) -bond system in ( O_{3} )
C. Ozone layer is being depleted by fluorocarbons.
D. All the above are correct statements.
12
491 The order of calorific values of fuel
gases is:
A. Carburetted water gas > Producer gas
Semi water gas
B. Carburetted water gas ( > ) Semi water gas
Producer gas
C. Producer gas ( > ) Semi water gas ( > )
Carburetted water gas
D. Semi water gas > Producer gas
Carburetted water gas
11
492 Zn gives ( mathrm{H}_{2} ) gas with ( mathrm{H}_{2} mathrm{SO}_{4} ) & HCl but
not with HNO ( _{3} ) because:
A. ( Z n ) act as oxidising agent when react with ( H N O_{3} )
B. ( H N O_{3} ) is weaker acid then ( H_{2} ) SO ( _{4} ) & ( H C l )
C. in electrochemical series ( Z n ) is above hydrogen
D. ( N O_{3}^{Theta} ) is reduced in prefference to hydronium ion
12
493 Pnicogens are the elements of group:
A . 15
B. 13
c. vıl
D. zero
11
494 State uses of nitrogen 12
495 Which of the following elements can be involved in ( mathrm{p} pi-d pi ) bonding?
A. carbon
B. Nitrogen
c. Phosphorus
D. Boron
12
496 Which of the following gas is heavier than air?
This question has multiple correct options
A. ( N_{2} )
в. ( O_{2} )
( c cdot C O_{2} )
D. ( H_{2} )
12
497 Gas that strikes in thundering of light
is :
A. ( C O )
в. ( N O )
( c cdot C O_{2} )
D. ( H_{2} )
12
498 Which of the following hydrolysis product is not common in hydrolysis of
( X e F_{2} ) and ( X e F_{4} ) respectively?
This question has multiple correct options
A. ( X e O_{3} )
в. ( H F )
( c cdot X e )
D. ( O_{2} )
12
499 Q. 46 Boron fluoride exists as BF, but boron hydride doesn’t exist as BH 3. Give
reason. In which form does it exist ? Explain its structure.
11
500 Discuss the general characteristics of Group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity 12
501 Noble gases are group of elements which exhibit very
A. High chemical activity
B. Low chemical activity
c. Minimum electronegativity
D. Much paramagnetic properties
12
502 Consider the following equilibrium
reaction:
( boldsymbol{N} boldsymbol{H}_{3}+boldsymbol{N} boldsymbol{H}_{3} rightleftharpoons boldsymbol{N} boldsymbol{H}_{4}^{+}+boldsymbol{N} boldsymbol{H}_{2} )
Find the ionic product of the above equilibrium reaction?
12
503 The fluoride of ( x e n o n ) with zero dipole
moment is :
This question has multiple correct options
A ( cdot mathrm{xeF}_{6} )
в. ( mathrm{xeO}_{3} )
c. ( mathrm{xeF}_{4} )
D. XeF ( _{2} )
12
504 Formula for the following compound
Thallium (I) sulphate is ( T l_{2} S O_{4} )
A. True
B. False
11
505 How many elements in group 14 are
used as semiconductor?
11
506 Which of the folowing is incorrect?
A. Nitric oxide depletes ozone layer in upper atmosphere
B. ( O_{3} ) is a powerful oxidising agent
C . Acidic strength increases from ( H_{2} ) Te to ( H_{2} O )
D. ( S O_{2} ) is redusing agent while ( T e O_{2} ) is an oxidising
agent
12
507 Give reasons for the following:
Iron is rendered passive with fuming nitric acid.
12
508 Which of the following gases is used for the qualitative analysis of metal ions?
A. ( C O_{2} )
в. ( H_{2} ).
( c cdot s O_{2} )
D. ( S O_{3} )
12
509 Which oxide is colourless and neutral?
A. ( N_{2} O_{3} )
в. ( N_{2} ),
( mathrm{c} cdot mathrm{N}_{2} mathrm{O}_{4} )
D. ( N_{2} O_{5} )
12
510 The action of bleaching powder on ethyl alcohol gives:
A ( cdot mathrm{CCl}_{4} )
B. CHCls
c. cocl
D. Ether
12
511 ( mathrm{XeF}_{4} ) and ( mathrm{XeF}_{6} ) are expected to
be
A. oxidizing
B. reducing
c. unreactive
D. strongly basic
12
512 The hybridisation state of the central atom and shape of the molecules is
given below. Mark the incorrect combination.
A . ( S O_{3}-s p^{2} ) hybridisation, planar triangular
B. ( S O_{2}-s p^{2} ) hybridisation, ( V ) -shaped
c. ( H_{2} S O_{4}-s p^{2} ) hybridisation, ( v ) -shaped
D. ( O_{3}-s p^{2} ) hybridisation, angular
12
513 The order of stability of metal oxides is
( mathbf{A} cdot A l_{2} O_{3}<M g O<F e_{2} O_{3}<C r_{2} O_{3} )
B. ( C r_{2} O_{3}<M g O<A l_{2} O_{3}<F e_{2} O_{3} )
( mathbf{c} cdot F e_{2} O_{3}<C r_{2} O_{3}<A l_{2} O_{3}<M g O )
D. ( F e_{2} O_{3}<A l_{2} O_{3}<C r_{2} O_{3}<M g O )
12
514 ( begin{array}{ll}text { List-I } & text { List-II } \ text { A) } S_{8}+N a_{2} S O_{3} rightarrow & text { 1) } M text { ustard gas } \ text { B) } 2 C_{2} H_{4}+S_{2} C l_{2} rightarrow & text { 2) } H_{2} S O_{3} \ text { C) } S+3 F_{2} rightarrow & text { 3) } N a_{2} S_{2} O_{3} \ text { D) } S C l_{4}+H_{2} O rightarrow & text { 4) } S F_{6}end{array} ) The correct match is:
( A cdot(A)-4,(B)-2,(C)-1,(D)-3 )
B. ( (A)-3,(B)-1,(C)-4,(D)-2 )
C ( cdot(A)-1,(B)-3,(C)-2,(D)-4 )
D. ( (A)-2,(B)-4,(C)-3,(D)-1 )
12
515 Fill in the blanks.
sulphur is prepared by passing hydrogen sulphide gas into an aqueous solution of sulphur dioxide.
12
516 Shape of ( X e F_{2} ) molecule is :
A. Trigonal bi pyramidal
B. Tetrahedral
c. Square pyramidal
D. Linear
12
517 Draw the structure of xenon
hexafluoride ( left(X e F_{6}right) ) molecule and
state the hybridisation of the central
atom.
12
518 When sulphur dioxide is passed in an acidified ( K_{2} C r_{2} O_{7} ) solution, the
oxidation state of sulphur is changed from:
A . +4 to 0
B. +4 to +2
( mathbf{c} cdot+4 ) to +6
D. +6 to +4
12
519 What is the hybridization of the chlorine
( operatorname{atom} operatorname{in} C l F_{3} ) molecule?
12
520 Wand X are ( _{text {- – }} ), respectively.
( A cdot O_{3} ) and ( P_{4} O_{6} )
B. ( O_{2} ) and ( P_{4} O_{6} )
( mathrm{c} cdot mathrm{O}_{2} ) and ( P_{4} mathrm{O}_{1} )
D. ( O_{3} ) and ( P_{4} O_{1} )
12
521 Explain the bleaching action of ozone. 12
522 How is phosphine prepared using the following reagents?
(a) ( boldsymbol{H} boldsymbol{C l} )
(b) ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} )
(c) Caustic soda
12
523 In which of the following preparation, orthophosphoric acid is used?
A. Metaphosphoric acid
B. Phosphorus acid
c. sulphurous acid
D. Pyrophosphoric acid
12
524 Name the other ion formed when
ammonia dissolves in water
12
525 Gold and platinum do not dissolve
either in conc. ( H C l ) or conc. ( H N O_{3} ) but
dissolves in the mixture of 3 parts of
conc. ( H C l ) and 1 part of conc. ( H N O_{3} )
Give reason and write the necessary chemical equations.
12
526 Q. 67 Assertion (A) Both rhombic and monoclinic sulphur exist as S, but!
oxygen exists as 0.
Reason (R) Oxygen forms prt – ptt multiple bond due to small size and
small bond length but prt – pit bonding is not possible in sulphur.
Ane La Botha
monts and reason is the
12
527 ( boldsymbol{B}(boldsymbol{O} boldsymbol{H})_{3}+boldsymbol{N} boldsymbol{a} boldsymbol{O} boldsymbol{H} rightleftharpoons boldsymbol{N} boldsymbol{a} boldsymbol{B} boldsymbol{O}_{2}+ )
( boldsymbol{N} boldsymbol{a}left[boldsymbol{B}(boldsymbol{O} boldsymbol{H})_{4}right]+boldsymbol{H}_{2} boldsymbol{O} )
How can this reaction is made to
proceed in forward direction?
A. Addition of cis 1,2 diol
B. Addition of borax
c. Addition of trans 1,2 dio
D. Addition of ( N a_{2} H P O_{4} )
11
528 The probable element El can be:
( A cdot B )
( B )
( c )
( D )
12
529 Select the correct statement(s).
This question has multiple correct options
A. Passage of sulphur dioxide or of hydrogen sulphide (not in excess) in to a solution of an iodate acidified with dilute hydrochloric acid, liberates iodine
B. Phosphate rock, ( C a_{3}left(P O_{4}right)_{2} ) on heating with sand and coke in electric furance at ( 1400-1500^{circ} mathrm{C} ) yields
dimeric phosphorus pentaoxide
C. Reaction of ( H_{2} S ) on aqueous solution of sodium sulphite yields sodium thiosulphate
D. Sodium hypophosphite on warming with copper sulphate solution gives red precipitate of copper (I) hydride
12
530 10) Change in enthalpy is negative for preparation
in which of the following reactions conc. H SO, is used as an oxidising
reagent?
(a) CaF, + HSO Caso, + 2HF
(b) 2 HI+ H,SO. -> 1,+ SO, + 2H2O
(c) Cu + 2H,SO. – Cuso,+SO, + 2H,0
(d) NaCl + H SO N aHSO, + HCI
12
531 How does ammonia react with a
solution of ( C u^{2+} ? )
12
532 Write the name of radioactive halogen? 12
533 Which among the following oxides of nitrogen is called nitrogen sesquioxide?
A ( cdot N O_{2} )
B. ( N_{2} O_{3} )
c. ( N_{2} O_{4} )
D. ( N_{2} O_{5} )
12
534 Oxidative ozonolysis of 2-butene in the presence of zinc or dimethyl sulphide gives:
A. ( C H_{3} C H O )
в. ( C H_{3} ) СООН
( c cdot C O_{2} )
D. ( left(C H_{3}right)_{2} C O )
12
535 The number of lone pairs of electrons on
xenon atom in ( mathrm{XeF}_{4} ) molecule is:
( A cdot 4 )
B. 3
( c cdot 2 )
D. zero
12
536 Red and white phosphorus will differ
but not in:
A . smell
B. solubility in ( C H C I_{3} ).
c. exhibiting phosphorescence.
D. reactions with ( H N O_{3} )
12
537 In the known interhalogen compounds the maximum oxidation state of
halogen atom is:
( A )
B. 5
( c cdot 7 )
D. 8
12
538 Describe laboratory method of preparation of sulphur dioxide giving chemical equations. Give chemical equations of the reactions of sulphur
dioxide with potassium permanganate and lime water
12
539 5.
When glass is heated, it
(a) does not melt at a fixed temperature
(b) vapourises
(c) melts only above 1000°C
(d) None of these
11
540 Which of the following is acidic?
A ( cdot N H_{3} )
в. ( N_{2} H_{4} )
c. ( N_{2} H_{2} )
D. ( N_{3} H )
12
541 A mixture of three parts of concentrated
hydrogen chloride with one part of concentrated nitric acid is known as:
A . quick lime
B. aqua regia
c. hydrazine
D. none of these
12
542 Which of the following property does not support anamolous behaviour of boron?
A. Small size
B. High electronegativity
c. High ionization energy
D. Formation of trinalides
11
543 Which of the following forms are the most basic in ( 0.1 mathrm{M} ) solution?
A. ( mathrm{NaCl} )
в. NaOCl
c. ( mathrm{NaClO}_{2} )
D. ( mathrm{NaClO}_{3} )
12
544 Assertion
Chlorine water must be stored in dark
colored bottles.
Reason
Hypochlorous acid on exposure to sunlight decomposes to ( H_{2} ) and ( C l_{2} )
gas.
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
545 In the clathrates of xenon with water,
the nature of bonding between xenon and water molecule is :
A. Covalent
B. Hydrogen bonding
c. Co-ordinate
D. Dipole-induced dipole interaction
12
546 What is the chief constituent of Pyrex glass?
A. ( B_{2} O_{3} )
as
в. ( operatorname{si} 0_{2} )
c. ( A l_{2} O_{3} )
D. ( N a O_{2} )
11
547 Amphoteric species is:
A. ( N a_{3} P O_{4} )
B. ( H S O_{4}^{-} )
c. КОН
D. ( H N O_{3} )
E ( cdot C_{2} O_{4}^{2-} )
12
548 The composition in brown ring test is :
( mathbf{A} cdotleft[F eleft(H_{2} Oright)_{6} N Oright] S O_{4} )
( mathbf{B} cdotleft[F eleft(H_{2} Oright)_{5} N Oright] S O_{4} )
( mathbf{c} cdotleft[F eleft(H_{2} Oright)_{4}(N O)_{2}right] S O_{4} )
( mathbf{D} cdotleft[F eleft(H_{2} Oright)_{3} N Oright] S O_{4} )
12
549 Among the following compounds, which
on heating do not produce ( N_{2} ? )
A ( cdotleft(N H_{4}right)_{2} C r_{2} O_{7} )
B. ( N H_{4} C l+N a N O_{2} )
c. ( N H_{4} C l+C a O )
D. ( B aleft(N_{3}right)_{2} )
12
550 ( N_{2}(g)+3 H_{2}(g)_{200-300} frac{773 K}{b a r} 2 N H_{3}(g)+ )
heat
Which of the following works as a catalyst?
( mathbf{A} cdot A l_{2} O_{3} )
в. ( K_{2} ),
c. ( F e )
D. ( V_{2} O_{5} )
12
551 Write the balanced reaction of
ammonia with sulphuric acid.
12
552 Draw the structures of the following molecules:
(i) ( boldsymbol{X} boldsymbol{e} boldsymbol{F}_{2} )
(ii) ( boldsymbol{H}_{2} boldsymbol{S}_{2} boldsymbol{O}_{8} )
12
553 Equivalent weight of ( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{4} ) in each of
the reaction will be respectively:
( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{4}+boldsymbol{O} boldsymbol{H}^{-} rightarrow boldsymbol{H}_{2} boldsymbol{P} boldsymbol{O}_{4}^{-}+boldsymbol{H}_{2} boldsymbol{O} )
( boldsymbol{H}_{3} boldsymbol{P} boldsymbol{O}_{4}+boldsymbol{2} boldsymbol{O} boldsymbol{H}^{-} rightarrow boldsymbol{H} boldsymbol{P} boldsymbol{O}_{4}^{2-}+boldsymbol{2} boldsymbol{H}_{2} boldsymbol{O} )
( boldsymbol{H}_{3} boldsymbol{P O}_{4}+boldsymbol{3} boldsymbol{O} boldsymbol{H}^{-} rightarrow boldsymbol{P} boldsymbol{O}_{4}^{3-}+boldsymbol{3} boldsymbol{H}_{2} boldsymbol{O} )
A . 98,49,32.67
B. 49, 98, 32.67
c. 98,32.67,49
D. 32.67, 49, 98
12
554 Which of the following statements is
true?
( mathbf{A} cdot H_{3} P O_{3} ) is stronger acid than ( H_{2} S O_{3} )
B. In aqueous medium, HF is a stronger acid than HCI
C ( . H C l O_{4} ) is a weaker acid than ( H C l O_{3} )
D. ( H N O_{3} ) is a stronger acid than ( H N O_{2} )
12
555 Which of the following acid occurs in polymeric form?
A. ( H P O_{3} )
в. ( H_{4} P_{2} O_{7} )
c. ( H_{3} P O_{4} )
D. none of these
12
556 The compound used for etching of glass
is:
A. ( H )
B. HBr
c. нс।
D. нF
11
557 Identify the salts which on heating produce mixture of gases. This question has multiple correct options
A. ( N a N O_{3} )
B. ( P bleft(N O_{3}right)_{2} )
c. ( C uleft(N O_{3}right)_{2} )
D. ( K N O_{3} )
12
558 Select the correct options about the solubility of the following species in
( boldsymbol{H}_{2} boldsymbol{O} ) and ( boldsymbol{N} boldsymbol{H}_{3}(mathbf{a q}) )
( A g F, A g C N, A g C l, A g l, C a F_{2}, C a C l_{2} )
This question has multiple correct options
A ( . A g F ) and ( C a C l_{2} ) are soluble in ( H_{2} O )
B. ( A g C N ) and ( A g C l ) are soluble in ( N H_{3} )
c. ( A g I ) and ( C a F_{2} ) are soluble in ( H_{2} O ) and ( N H_{3} ) (aq) both
D. None of these
12
559 Which one is most stable to heat:
A . ( H C l O )
в. ( H C l O_{2} )
c. ( H C l O )
D. ( H C l O_{4} )
12
560 A bottle completely filled with conc.
( H_{2} S O_{4} ) is left unstoppered for several
days and we observe spontaneous overflow of acid. It is due to
A. change in temperature
B. hygroscopic nature of ( H_{2} S O_{4} )
C. absorption of air by ( H_{2} S O_{4} )
D. dehydration of ( H_{2} S O_{4} )
12
561 Which of the following compound on hydrolysis form white turbidity?
A ( cdot N C l_{3} )
в. ( P C l_{3} )
c. ( A s C l_{3} )
D. ( S b C l_{3} )
12
562 Which process can be used for production of sulfuric acid from sulfur burning or for regeneration of the spent acid from alkylation plants?
A. Moisture sulphuric acid
B. Wet sulphuric acid
c. Dry sulphuric acid
D. Alkylating sulphuric acid
12
563 What are allotropes? Write the names of allotropes of phosphorus. 12
564 Which one of the following has the lowest m.p?
( A cdot B )
в. А।
( c cdot ) Ga
D. T
12
565 ( beta ) sulphur is stable between:
A ( cdot 114^{circ} mathrm{C} ) to ( 160^{circ} mathrm{C} )
B . ( 95.6^{circ} mathrm{C} ) to ( 119^{circ} mathrm{C} )
( mathbf{c} cdot 160^{circ} C ) to ( 230^{circ} C )
D. ( 112.8^{circ} mathrm{C} ) to ( 140^{circ} mathrm{C} )
12
566 Mustard gas can be prepared by the reaction of ethylene with:
( A cdot S F_{6} )
в. ( mathrm{SF}_{4} )
( c cdot operatorname{sCl}_{2} )
D. None of the above
12
567 The number of steps in which orthophosphoric acid is ionized is :
A.
B. 2
( c cdot 3 )
( D )
12
568 What is the formula of colorless
inactive gas D?
A. ( N_{2} )
в. ( H_{2} )
c. ( N H_{3} )
D. ( N O )
12
569 Which of the following are used as
fertilizers?
This question has multiple correct options
в. ( C aleft(H_{2} P O_{4}right)_{2} )
c. ( C a N C N )
D. ( C a C_{2} )
12
570 The substance which does not produce
( mathrm{O}_{2} ) after
reacting with ozone is:
A. ( H_{2} O_{2} )
в. ( H g )
c. ( K O H )
( mathrm{D} cdot mathrm{SO}_{2} )
12
571 How is ammonia collected?
A. Ammonia is less dense than air so it is collected by upward delivery.
B. Ammonia is more dense than air so it is collected by upward delivery.
C. Ammonia is more dense than air so it is collected by downward delivery.
D. None of the above
12
572 04.
ee in Contact process so is not absorbed directly in water to from H.SO, because we
reaction is highly exothermic, acid mist is formed. Hence, the reaction becomes dicunt
handle
Note
SBurners Soz
Precipator –
Arsenic
purifier
Testing
box
Cooling
and drying
Conc
H2SO4
H-S20
Oleum
Absorption
tower
Catalyst
chamber
Preheater
Flow chart of Contact process
12
573 Question 17. Nitric acid forms an oxide of nitrogen on reaction with
P.01. Write the reaction involved. Also write the resonating structures of
the oxide of nitrogen formed.
12
574 Hydride of nitrogen is called:
A. dinitrogen hydride
B. urea
c. ammonia
D. nitrous hydride
12
575 An element ( X ) forms two oxides ( X O )
and ( X O_{2} . ) The oxide ( X O ) is neutral but
( X O_{2} ) is acidic in nature. The element ( X )
is most likely to be:
A. sulphur
B. carbon
c. calcium
D. hydrogen
11
576 The basicity of phosphoric acid is:
( A cdot 1 )
B . 2
( c .3 )
D.
12
577 A nitrogenous fertilizers having more nitrogen is :
( mathbf{A} cdotleft(mathrm{NH}_{4}right)_{2} mathrm{SO}_{4} )
B. ( C aleft(N O_{3}right)_{2} )
c. ( N H_{2} C O N H_{2} )
D. ( N H_{4} N O_{3} )
12
578 Which one of the following
arrangements does not give the correct
picture of the trends indicated against
it?
This question has multiple correct options
( mathbf{A} cdot F_{2}>C l_{2}>B r_{2}>I_{2}: ) Bond dissociation energy
( mathbf{B} cdot F_{2}>C l_{2}>B r_{2}>I_{2}: ) Electronegativity
( mathbf{C} cdot F_{2}>C l_{2}>B r_{2}>I_{2}: ) Oxidizing nature
D. ( F_{2}>C l_{2}>B r_{2}>I_{2}: ) Electron gain enthalpy
12
579 The ( p K_{a} ) of oxoacids of chlorine in water
follows the order:
A. ( H C l O<H C l O_{3}<H C l O_{2}<H C l O_{4} )
в. ( H C l O_{4}<H C l O_{3}<H C l O_{2}<H C l O )
c. ( H C l O_{4}<H C l O_{2}<H C l O_{3}<H C l O )
D. ( H C l O_{2}<H C l O<H C l O_{3}<H C l O_{4} )
12
580 Give balanced equations for the
following reactions:
Concentrated hydrochloric acid and Potassium permanganate solution.
12
581 ( 1^{circ} ) alcohols preferably undergo
dehydration in presence of ( A l_{2} O_{3} )
A. ( E_{1} )
в. ( E_{2} )
c. ( S_{N} 1 )
D. ( S_{N} 2 )
11
582 The wrong statements about ( N H_{3} ) is :
A. it is oxidised with oxygen at ( 700^{circ} mathrm{C} ) in the presence of platinum
B. it gives black precipitate with calomel
( mathbf{C} cdot ) it can be dried by ( P_{2} O_{5}, H_{2} S O_{4} ) and ( C a C l_{2} )
D. it gives white fumes with HCI
12
583 Bauxite containing impurities of iron oxide is purified by :
A. Hoop’s process
B. Serpeck’s process
c. Bayer’s process
D. Electrolytic process
11
584 Which is the correct sequence in the following properties? For the correct order mark(T) and for the incorrect
order mark (F):
(a) Lewis acidity order: ( boldsymbol{S} boldsymbol{i} boldsymbol{F}_{4}< )
( boldsymbol{S} boldsymbol{i} boldsymbol{C l}_{4}<boldsymbol{S} boldsymbol{i} boldsymbol{B} boldsymbol{r}_{4}S b H_{3}> )
( boldsymbol{A} boldsymbol{s} boldsymbol{H}_{3}>boldsymbol{P} boldsymbol{H}_{3} )
(c) Boiling point ( : N H_{3}>S b H_{3}> )
( boldsymbol{A} boldsymbol{s} boldsymbol{H}_{3}>boldsymbol{P} boldsymbol{H}_{3} )
(d) Dipole moment order : ( N H_{3}> )
( boldsymbol{S b H}_{3}>boldsymbol{A s H}_{3}>boldsymbol{P H}_{3} )
A. FTFT
в. TFTF
c. FFTT
D. FFTF
12
585 When ( H_{2} S ) gas is passed through nitric acid, the product is:
A. rhombic sulphur
B. prismatic sulphur
c. amorphous sulphur
D. monoclinic sulphur
E. plastic sulphur
12
586 The bleaching action of chlorine is an oxidation reaction. Why? 12
587 ( boldsymbol{C} boldsymbol{a}_{2} boldsymbol{B}_{6} boldsymbol{O}_{11}+boldsymbol{2} boldsymbol{N} boldsymbol{a}_{2} boldsymbol{C O}_{3} rightarrow boldsymbol{X}+ )
( 2 C a C O_{3}+2 N a_{2} B O_{2} . ) The compound ( x )
in the above reaction is :
A. ( N a_{2} B_{4} O_{7} )
в. ( H B O_{2} )
c. ( H_{3} B O_{3} )
D. ( H_{2} B_{4} O_{7} )
11
588 Which of the following halides is the
most stable?
A. ( C C l_{4} )
в. ( C B r_{4} )
c. ( C F_{4} )
D. ( C l_{4} )
11
589 Ozone is tested by:
A ( . A g )
в. ( H g )
( c cdot Z n )
D. ( A u )
12
590 Nitrous oxide is:
A. soluble in cold water.
B. soluble in hot ( O H_{2} )
c. acidic in nature.
D. none of these.
12
591 Assertion: Diborane has two types
of hydrogens.

Reason : By methylation only four hydrogen atoms of diborane are substituted forming ( M e_{4} B_{2} H_{2} )
A. Both Assertion and Reason are true and Reason is correct explanation of Assertion
B. Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
c. Assertion is true but Reason is false
D. Assertion is false but Reason is true

11
592 The gas oxygen from thermal
decomposition of ( left(N H_{4}right)_{2} C r_{2} O_{7} )
A. Oxygen
B. Nitric oxide
c. Ammonia
D. Nitrogen
12
593 What happens when white phosphorus
is heated with concentrated ( N a O H )
solution in an inert atmosphere of ( C O_{2} ) ?
12
594 The following questions are based on the preparation of ammonia gas in the laboratory:
Name the compound normally used as a drying agent during the process.
12
595 Choose the correct statement from the
following:
This question has multiple correct options
A. Nitrogen is neutral to litmus
B. Nitrogen is a noncombustible and non-supporter of combustion
C. Nitrogen is a poisonous gas
D. At low temperature, nitrogen can be liquefied on compression
12
596 The curve of binding energy per nucleon
as a function of atomic mass number
has a sharp peak of helium nucleus. This implies that helium:
A. can easily be broken up
B. is very stable
c. can be used as fissionable material
D. is radioactive
12
597 Phosgene can obtained when:
A. white phosphorus reacts with alkali
B. calcium phosphide reacts with water.
C. chloroform reacts with air.
D. bone comes in contact with water.
12
598 Q32. Give one method for industrial preparation and one for laboratory preparation of CO and CO2
each.
11
599 Ammonia is used as a:
A. fire extinguisher
B. fertilizer
C. refrigerant
D. fungicide
12
600 Assertion
The value of the van der Waals’ constant
( a^{prime} ) is larger for ammonia than for
nitrogen.
Reason
Hydrogen bonding is present in ammonia.
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
601 Which of the following does not contain fluorine?
A. Fluorspar
B. cryolite
c. Flouorospatite
D. Chile saltpeter
12
602 Shapes of certain interhalogen
compounds are stated below. Which one of them is not correctly stated?
A. ( B r F_{3} ) : Planar T-shaped
B. ( I C l_{3}: ) Planar dimeric
C. ( I F_{7} ) : Pentagonal bipyramid
D. ( B r F_{5} ) : Trigonal bipyramid
12
603 Give any three oxidation reactions of
Ozone ( left(O_{3}right) ) with chemical equations.
12
604 Identify the correct statement(s) about
orthoboric acid.
This question has multiple correct options
A. It has a layer structure in which planar ( B O_{3} ) units are joined by hydrogen bonds
B. Orthoboric acid ( left(H_{3} B O_{3}right) ) is a weak monobasic Lewis acid
c. on heating ortho-boric acid form meta-boric acid and on further heating to red hot,forms boric oxide anhdride
D. None of the above
11
605 Statement – l: He -II has high viscosity
and flows downward.

Statement – II: Liquid helium is used as
cryogenic liquid.
A. Both I and II are true. II is correct
explanation of I.
B. Both I and II are true. II is not correct
explanation of I
C. I is true but II is false
D. I is false but II is true

12
606 Elements of group 14:
This question has multiple correct options
A. exhibit oxidation state of +4 only
B. exhibit oxidation state of +2 and +4
C. form ( M^{2} ) and ( M^{4+} ) ions
D. form ( M^{2+} ) and ( M^{4+} ) ions
11
607 The water gas when used for the formation of methanol is called:
A. Fuel gas
B. syngas
c. Natural gas
D. Producer gas
11
608 Which of the following statements
is/are true about nitrogen?
This question has multiple correct options
A. Its atomic number is 7
B. It is very difficult to identify
C. It is a typical non metal
D. Ease of formation of triple bond
12
609 Draw structures of ( N H_{3}, P C l_{5}, P C l_{3} ) 12
610 What is released when di
nitrogen trioxide is reacted with a base
like ( N a O H ? )
( A cdot O_{2} )
в. ( N_{2} )
( mathrm{c} cdot mathrm{H}_{2} mathrm{O} )
D. no gas is released
12
611 The correct order of acidic strength of
oxy – acids of chlorine is:
( mathbf{A} cdot H C l O<H C l O_{2}<H C l O_{3}<H C l O_{4} )
B ( cdot H C l O_{4}<H C l O_{3}<H C l O_{2}H C l O_{4}>H C l O_{3}>H C l O_{2} )
D. ( H C l O_{4}H C l O_{3}>H C l O )
12
612 Which is true about ( N_{2} O_{5} ? )
This question has multiple correct options
A. It is anhydride of ( H N O_{3} )
B. In solid state it exists as ( left[N O_{2}^{+}right]left[N O_{3}^{-}right] )
C. It is structurally similar at ( P_{2} O_{5} )
D. It can be prepared by heating ( H N O_{3} ) over ( P_{2} O_{5} )
12
613 ( P H_{3} ) can be obtained by:
This question has multiple correct options
A. heating hypophosphorus acid.
B. heating orthophosphorus acid.
C. reacting white phosphorus with hot conc,NaOH.
D. hydrolysis of calcium phosphide.
12
614 Nitrolim is a mixture of:
A ( cdot mathrm{Ca} mathrm{C}_{2}+mathrm{N}_{2} )
B. ( mathrm{CaCN}_{2}+ ) graphite
c. ( mathrm{Ca} ) NCN ( + ) diamond
D. ( mathrm{Ca}(mathrm{CN})_{2}+mathrm{C} )
12
615 The elements with atomic numbers 9
17,35,53 and 85 belong to noble gases columnz
A. True
B. False
12
616 a) How is chlorine prepared in Deacon’s process? How does it react with the
following?
¡) Cold and dilute NaOH
ii) Hot and concentrated NaOH
b) Give chemical equations to
manufacture of Sulphuric Acid by
contact process.
12
617 Sulphur dioxide is a strong reducing agent. However, it can also act as an
oxidizing agent. Which of the following reactions shows its oxidizing nature?
A. Bleaching flower petalss
B. Decolourising of acidfied KMnO ( _{4} ) solution
c. Reaction with ( H_{2} S ) to give sulphur
D. Turning acidified dichromate paper green
12
618 Compound A undergoes hydrolysis to produce a colourless gas with rotten fish smell. The gas gives a vortex ring. The gas is:
A ( . P H_{3} )
в. ( P_{2} O_{3} )
c. ( P_{2} O_{5} )
D. ( P_{2} S_{5} )
12
619 Write balanced equations for:
(i) ( boldsymbol{B} boldsymbol{F}_{3}+boldsymbol{L} boldsymbol{i} boldsymbol{H} rightarrow )
(ii) ( B_{2} H_{6}+H_{2} O rightarrow )
(iii) ( N a H+B_{2} H_{6} rightarrow )
(iv) ( H_{3} B O_{3} stackrel{leftrightarrow}{rightarrow} )
(v) ( A l+N a O H rightarrow )
(vi) ( B_{2} H_{6}+N H_{3} rightarrow )
11
620 Which of the following statements are
true regarding oxides of nitrogen?
This question has multiple correct options
( mathbf{A} cdot N O_{2} ) is a mixed anhydride of ( H N O_{2} ) and ( H N O_{3} )
B. ( N_{2} O_{3} ) is not soluble in water.
C ( cdot N_{2} O ) and ( N O ) are anhydrides of ( H N O_{2} )
D. ( N_{2} O_{5} ) is anhydride of ( H N O_{3} )
12
621 Hydrolysis of one mole of peroxodisulphuric produces:
A. two moles of sulphuric acid.
B. two moles of peroxomonosulphuric acid
c. one mole of sulphuric acid and one mole of peroxomonosulphuric acid.
D. one mole each of sulphuric acid peroxomonosulphuric acid and hydrogen peroxide.
12
622 ( P ) and ( Q ), respectively are the sodium salts of:
A. hypochlorous and chloric acids
B. hypochlorous and chlorous acids
c. chloric and perchloric acids
D. chloric and hypochlorous acids
12
623 ( S-S ) bond is present in :
A ( cdot alpha-left(S O_{3}right)_{n} )
B ( cdot gamma-left(S_{3} O_{9}right) )
c. ( H_{2} S_{2} O_{3} )
D. ( H_{2} S_{2} O_{8} )
12
624 Which type of hybridsation is present in carbon atom in fullerence? 11
625 The gas which burns with blue flame is:
A. ( C O )
в. ( O_{2} )
c. ( N_{2} )
D. ( C O_{2} )
11
626 Which of the following species is/are
formed when conc. ( H N O_{3} ) is added to
conc. sulphuric acid?
This question has multiple correct options
A ( cdot N O_{3} )
B. ( N O_{2}^{+} )
c. ( N O^{+} )
D. ( H S O_{4} )
12
627 An inorganic salt (A) is decomposed at about ( 523 mathrm{K} ) to give products ( (mathrm{B}) ) and
(C). Compound (C) is a liquid at room temperature and is neutral to litmus
paper while oxide (B) on burning with phosphorous, given a dehydrating agent
(D). Compounds ( (A),(B),(C) ) and ( (D) ) will be identified as :
A. ( N H_{4} N O_{3}, N_{2} O, H_{2} O, P_{2} O_{5} )
B. ( N H_{4} N O_{2}, k_{2} O, H_{2} O, P_{2} O_{5} )
c. ( C a C O_{3}, C a O, H_{2} O, C a C l_{2} )
D. ( C a C O_{3}, C a O, H_{2} O, C a(O H)_{2} )
12
628 Choose the correct on from the given four
options:
Consider equation:
[
mathrm{P}_{4} mathrm{O}_{10}+mathrm{H}_{2} mathrm{O} rightarrow mathrm{H}_{3} mathrm{PO}_{4}
]
Number of moles of ( mathrm{H}_{3} mathrm{PO}_{4} ) produced by
reaction are 1 mole of ( P_{4} O_{10} )
is
2
4
6
8
12
629 Oxidation number of ( boldsymbol{F} ) in ( boldsymbol{H} boldsymbol{F} )
( A cdot+1 )
B. – –
( c cdot 0 )
( D cdot+2 )
( E cdot+3 )
12
630 Buckminster fullerene is:
A. graphite
B. diamond
( c cdot c-60 )
D. quartz
11
631 Which one has the highest boiling point?
A ( cdot H_{2} O )
в. ( H_{2} ) Те
c. ( H_{2} )
D. ( H_{2} S e )
12
632 Based on M.O.T, explain the electronic
configuration of the Hydrogen molecule
and ( B e_{2} )
11
633 Q.3 The geometry of a complex species can be understood from the knowledge
of type of hybridisation of orbitals of central atom. The hybridisation of
orbitals of central atom in [B(OH)] and the geometry of the complex
are respectively
(a) sp, tetrahedral
(b) sp, square planar
(c) spºd?, octahedral!
(d) dsp?, square planar
11
634 Which of the following is most acidic?
A ( . H_{2} O )
в. ( H_{2} ).
( mathbf{c} cdot H_{2} S e )
D. ( H_{2} T e )
12
635 Make the correct pairs from below
mentioned ( X ) and ( Y )
[
boldsymbol{X}
]
a) Dehydrating agent
1) Sulphur dioxide gas
b) In preparation of fire
2) Concentrated crackers ( quad ) sulphur acid
c) Weak bleaching agent
3 ) Dihydrogen gas
d) Lightest gas
4) Sulphur
( mathbf{A} cdot(a-2),(b-4),(c-1),(d-3) )
B ( cdot(a-3),(b-2),(c-4),(d-1) )
C ( .(a-4),(b-3),(c-1),(d-2) )
D. ( (a-3),(b-1),(c-2),(d-4) )
12
636 The brilliance of diamonds is due to the
internal reflection of light the light is slowed down and bent away from its original path because it strikes:
A. tightly-bound nucleus
B. the nucleus (centre) of carbon atoms
c. loosely-held mobile electrons
D. layers of carbon atoms
11
637 What may be expected to happen when phosphine gas is mixed with chlorine gas?
A. ( P C l_{3} ) and ( H C l ) are formed and the mixture warms up
B. ( P C l_{3} ) and ( H C l ) are formed and the mixture cools down
C. The mixture only cools down
D. None of the above
12
638 Chlorine turns moist starch iodide
paper blue black.Why?
12
639 Select correct statement(s).
A ( . ) Equivalent mass of ( X e O_{3}= ) ( frac{text {molar mass}}{6} ) and Equivalent mass of ( H X e O_{4}^{-}= )
( frac{text { molar mass }}{6} )
B. As reaction I or II goes to forward side, pressure increases
C. Both are correct statements
D. None of the above is correct statement
12
640 Which of the following is not soluble in
water?
A. ( H_{2} )
в. ( O_{2} )
( c cdot s O_{2} )
D. ( C O_{2} )
12
641 Holmes signals can be given by using:
A. ( C a C_{2}+C a C N_{2} )
В. ( C a C_{2}+C a_{3} P_{2} )
( mathbf{c} cdot C a C_{2}+C a C O_{3} )
D. ( C a_{3} P_{2}+C a C N_{2} )
12
642 Of the following, the anhydride of nitric acid is:
A ( cdot N_{2} O )
B. ( N O )
( c cdot N O_{2} )
D. ( N_{2} O_{5} )
12
643 How many electrons can fit in the orbital for which ( n=3 ) and ( l=1 ? )
A . 10
B. 14
( c cdot 2 )
D. 6
11
644 Question 23. Why are halogens strong oxidizing agents?
Halogens have only one electron less than the nearest inert gas
configuration.
12
645 Which of the following compounds has hexagonal structure?
A. Diamond
в. ( N a C l )
c. ( K C l )
D. Graphite
11
646 ( C l_{2} ) gas acts as powerful oxidizing
agent. Give reason.
12
647 Which of the following option is
correctly matched?
( mathbf{A} cdot S_{2} O_{9} ; ) contains no ( S-S ) linkage
B. ( S_{2} O_{6}^{2-} ; ) contains ( O-O ) linkage
( mathbf{C} cdotleft(H P O_{3}right)_{3} ; ) contains ( P-P ) linkage
D. ( S_{2} O_{6}^{2-} ; ) contains ( S-S ) linkage
12
648 Which of the following does not have ( s-s ) linkage?
( A cdot S_{2} O_{8}^{2-} )
B. ( S_{2} O_{6}^{2-} )
( mathrm{c} cdot S_{2} O_{5}^{2} )
D. ( S_{2} O_{3}^{2-} )
12
649 Assertion
Red phosphorus is used in match
industry.
Reason
Red phosphorus shows
phosphorescence.
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
650 Red phosphorous is used in making:
A . red plastics
B. red dyes for plastics
c. safety match-striking surfaces
D. air fresheners
12
651 Which of them decomposes ( S O_{3} ) to ( S O_{2} )
?
A ( . S O C l_{2} )
в. ( S C l )
c. ( S C l_{2} )
D. ( N a O H )
12
652 Question 1. In the preparation of H2SO4 by contact process, why
SO, not absorbed directly in water to form H,SO,?
12
653 This wonderful acid has many uses. It is used for making explosives, pigments, dyes, hydrochloric acid, in sulphonation of oils to make detergents and in lead accumulators. Can you identify it?
A. Sulphuric acid
B. Sulphonic acid
c. Nitric acid
D. Sulphamic acid
12
654 Q35. The type of hybridisation of boron in diborane is
(a) sp (6) sp2 (c) sp (d) dsp?
11
655 Which of the following contain ( boldsymbol{P}-boldsymbol{P} )
bond?
A ( cdot P_{2} O_{7}^{4} )
B. ( P_{2} O_{6}^{2-} )
( mathrm{c} cdot P_{3} O_{9}^{3-} )
D. ( P_{2} O_{6}^{4-} )
12
656 When manganese dioxide is treated with ( H C l, ) oxidation state of chlorine on
the product side is:
This question has multiple correct options
A . -1
B. 0
( c cdot+1 )
( D cdot+3 )
12
657 The non-metal which cannot be oxidised
to its corresponding acid by nitric acid is :
A. carbon
B. sulphur
c. phosphorus
D. chlorine
12
658 If 1 stands for true and 0 stands for
false, then choose the correct code for
the following statement:
( H_{2} S O_{4} ) is a weaker acid than ( H C l, ) yet
( H C l ) is evolved when conc. ( H_{2} S O_{4} ) is
added to ( N a C l )
12
659 ( H C l O_{4}, H N O_{3} ) and ( H C l ) are all very
strong acids in aqueous solutions. In glacial acetic acid medium, their acid strength is such that:
A ( cdot H C l O_{4}>H N O_{3}>H C l )
в. ( H N O_{3}>H C l O_{4}>H C l )
c. ( H C l>H C l O_{4}>H N O_{3} )
D. ( H C l>H C l O_{4} sim H N O_{3} )
12
660 Of the following hydrides, which has the lowest boiling point?
A ( . N H_{3} )
в. ( P H_{3} )
( mathrm{c} cdot operatorname{SbH}_{3} )
D. ( A s H_{3} )
12
661 Which one of the following pentafluoride cannot be formed?
A. ( P F_{5} )
B. ( A s F_{5} )
c. ( S b F_{5} )
D. B iF
12
662 Make the correct pairs for the following
given ( mathrm{X} ) and ( mathrm{Y} . mathrm{X} ) contains substance
and Y has method of manufacture:
[
x
]
1. Extraction of Sulphur ( quad ) p. Contact process
2. Production of Nitric acid
q. Frasch method
3. Production of Sulphuric ( quad ) r. Haber’s process acid
4. Production of Ammonia ( quad ) s. Ostwald’s gas ( quad ) process
A ( cdot(1-s),(2-r),(3-q),(4-p) )
B. ( (1-r),(2-q),(3-s),(4-p) )
C ( .(1-q),(2-s),(3-p),(4-r) )
D. ( (1-s),(2-q),(3-r),(4-p) )
12
663 Paramagnetic species are :
A. ( N O, N O_{2}, O_{2} )
в. ( N_{2} O_{2}, N_{2} O_{2}, N_{2} O_{4}, O_{3} )
c. ( N O^{+}, N O_{2}^{+}, O_{2}^{+} )
D. ( O_{2}, C O, C O_{2} )
12
664 The only non-metal, which is a liquid at
room temperature is:
( A cdot O_{2} )
B. ( mathrm{F}_{2} )
( c cdot N_{2} )
D. Bra
12
665 ( H_{3} P O_{2} ) is a weak monobasic acid.
A. True
B. False
12
666 The no. of ( boldsymbol{P}-boldsymbol{O}-boldsymbol{P} ) bond(s) in cyclic
metaphosphoric acid is(are):
( mathbf{A} cdot mathbf{0} )
B . 2
( c .3 )
D.
12
667 Which of the following compound(s) is/are peroxyacids? This question has multiple correct options
A ( . H C l O_{4} )
в. ( H_{2} S O_{5} )
( mathrm{c} cdot mathrm{H}_{2} mathrm{S}_{2} mathrm{O}_{8} )
D. ( H_{3} P O_{5} )
12
668 Which of the following name is given to the hydrochloric acid by Lavoiser?
A. Mutaric acid
B. Glutaric acid
c. Tartaric acid
D. King of acids
12
669 In presence of small amount of water,
( P C l_{5} ) hydrolyzes to form:
A ( cdot P C l_{3} )
в. Рос
c. ( P O C l_{3} )
D. ( H_{3} P O_{3} )
12
670 Write down name, structural formula
and Hybridization of two Xenon compounds?
12
671 Oxygen is highly soluble in water.
A. True
B. False
12
672 The final product obtained when boric acid is heated to red heat is :
A. metaboric acid
B. tetraboric acid
c. boron oxide
D. pyroboric acid
11
673 ( mathrm{XeF}_{2} ) molecule is
A. Trigonal planar
B. Square planar
C. Linear
D. Pyramidal
12
674 In the solid state ( P C l_{5} ) exists as:
A ( cdotleft[P C l_{4}right]^{-} ) and ( left[P C l_{6}right]^{+} ) ions
B. covalent ( P C l_{5} ) molecules only
( mathbf{c} cdotleft[P C l_{4}right]^{+} ) and ( left[P C l_{6}right]^{-} ) ions
D. covalent ( P_{2} C l_{10} ) molecules only
12
675 A bottle of liquor ammonia should be cooled before opening. Give reason. 12
676 Give one word for the following. An acid prepared from sulphur. 12
677 Perchloric acid is prepared by the action of concentrated sulphuric acid
on:
A ( cdot mathrm{NaClO}_{4} )
в. ( mathrm{KClO}_{3} )
c. ( left.operatorname{ca}left(mathrm{ClO}_{3}right) mathrm{lO}_{3}right) )
D. Bac
12
678 Assertion
( A l(O H)_{3} ) is amphoteric in nature.
Reason
Al-O and O-H bonds can be broken with
equal ease in ( A l(O H)_{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. Assertion is incorrect but Reason is correct
12
679 Which of the following order(s) is/are
incorrect?
This question has multiple correct options
( mathbf{A} cdot H_{2} P O_{4}>H_{3} P O_{3}>H_{3} P O_{2} ) (reducing character)
B. ( N_{2} O<N OP H_{3}>A s H_{3}>S b H_{3}(text { basicity }) )
D ( cdot S b H_{3}>N H_{3}>A s H_{3}>P H_{3} ) (reducing character)
12
680 Graphite is a good conductor of electricity due to ?
A. Its giant tetrahedral polymer structure
B. Its high refractive index
c. Presence of free and mobile electrons
D. High IP value of carbon
11
681 Chlorine reacts with nitric oxide to
form?
A. ( N O C l_{2} )
в. ( N O C l )
( mathbf{c} cdot N O_{2} C l_{2} )
D. ( N O_{2} C l )
12
682 Sulphur colloid prepared by:
A. mechanical dispersion
B. oxidation
c. electrical dispersion
D. reduction
12
683 The compound molecular in nature in gas phase but ionic in solid state is :
A. ( P C l_{5} )
в. ( C C l_{4} )
c. ( P C l_{3} )
D. ( P O C l_{3} )
E. None of the above
12
684 Account for the following:
(i) ( B i(V) ) is a stronger oxidizing agent
( operatorname{than} boldsymbol{S b}(boldsymbol{V}) )
(ii) ( N-N ) single bond is weaker than
( boldsymbol{P}-boldsymbol{P} operatorname{single} ) bond
(iii) Noble gases have very low boiling points.
12
685 Assertion
Conc. ( H_{2} S O_{4} ) can not be used to
prepare pure HBr from NaBr.
Reason
It reacts slowly with NaBr
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
686 Q3. Why does borontrifluoride behave as a Lewis acid? 11
687 The carbon – carbon bond length in graphite is :
A . ( 1.34 A^{circ} )
B . 1.54 ( A^{circ} )
c. ( 1.42 A^{circ} )
D . 1.20A
11
688 Which of the following is an example of super octet molecule?
A. ( S F_{6} )
в. ( P C l_{5} )
c. ( I F_{7} )
D. All the three
12
689 Borax is the sodium salt of:
A. Ortho boric acid.
B. Meta boric acid.
C. Tetra boric acid.
D. Pyro boric acid.
11
690 Which of the following oxoacids of nitrogen has most acidic character?
I. ( N_{2} O_{3} )
( boldsymbol{I} boldsymbol{I} cdot boldsymbol{N} boldsymbol{O}_{2} )
III. ( N_{2} O_{5} )
( I V . N O )
( mathbf{A} cdot I I )
в. ( I I I )
( c . I V )
( D )
12
691 On adding ( H_{2} O ) to ( B i C l_{3} ) solution in ( H C l ) the compound produced is:
( mathbf{A} cdot B i_{2} O_{3} )
B ( cdot B i(O H)_{3} )
c. В гОС
D. ( B i O C l )
12
692 Which of the following combines with
( F e(I I) ) ions to form a brown complex?
A ( cdot N_{2} O )
B. ( N O )
( mathrm{c} cdot mathrm{N}_{2} mathrm{O}_{3} )
D. ( N O_{2} )
12
693 Which of the following undergoes hydrolysis very easily?
A ( cdot mathrm{NCl}_{3} )
в. PCls
c. ( mathrm{AsCl}_{3} )
D. BiCla
12
694 The building units of various crystalline forms of boron are:
A ( cdot B_{12} ) icosahedral units
B. ( B_{4} ) tetrahedral units
c. ( B_{6} ) octahedral units
D. ( B_{6} ) cubical units
11
695 Assertion: Fluorine exists only in -1
oxidation state.
Reason: Fluorine has ( 2 s^{2} 2 p^{5} )
configuration
A. If both assertion and reason are true and the reason is a correct explanation of the assertion
B. If both assertion and reason are true but reason is not a correct explanation of the assertion
C. If the assertion is true but reason is false
D. If both the assertion and reason are false
E. If the assertion is false but the reason is true
12
696 Which product will obtained in the
following reaction?
Reaction: ( boldsymbol{P}_{4_{(a)}}+mathbf{3} boldsymbol{N a O H}_{(a q)}+ )
( mathbf{3} boldsymbol{H}_{2} boldsymbol{O}_{(l)} longrightarrow )
( mathbf{A} cdot P H_{3_{(a)}}+3 N a_{2} H P O_{2_{(a)}} )
B. ( P H_{3_{(a)}}+3 N a H_{2} P O_{2_{l a q}} )
C. ( 2 P H_{3_{(l)}}+3 N a_{2} H P O_{2_{l a}} )
D. ( 2 P H_{3_{(l)}}+3 N a H_{2} P O_{2_{l a}} )
12
697 Q. 41 Describe the general trends in the following properties of the elements
in groups 13 and 14.
(a) Atomic size
(b) Ionisation enthalpy
(c) Metallic character
(d) Oxidation states
(e) Nature of halides
11
698 Argyrodite, briartite contain appreciable amounts of ( -? )
A . lead
B. germanium
c. zinc
D. copper
11
699 Man dies in an atmosphere of carbon
monoxide because it :
A ( cdot ) combines with the ( O_{2} ) present in the body to form ( C O_{2} )
B. reduces the organic matter of tissues.
c. combines with hemoglobin of blood, making it incapable of absorbing ( O_{2} )
D. dries up the blood
11
700 toppr
Q Type your question_

( 2 I^{-}(a q)+S_{2} O_{8}^{2-}(a q) rightarrow I_{2}(a q)+ )
( 2 S_{2} O_{4}^{-2}(a q)(s l o w) )
( boldsymbol{I}_{2}(boldsymbol{a} boldsymbol{q})+boldsymbol{2} boldsymbol{S}_{2} boldsymbol{O}_{3}^{2-}(boldsymbol{a} boldsymbol{q}) rightarrow boldsymbol{2} boldsymbol{I}^{-}(boldsymbol{a} boldsymbol{q})+ )
( boldsymbol{S}_{4} boldsymbol{O}_{boldsymbol{6}}^{boldsymbol{2}-}(boldsymbol{a} boldsymbol{q})(boldsymbol{f} boldsymbol{a} boldsymbol{s} boldsymbol{t}) )
A little of these sulphate ions along with starch are added in the first
reaction. The iodine formed in the first
reaction reacts with sulphate ions and
the blue colour of iodine starts
developing as soon as the whole ( S_{2} O_{3}^{2-} )
are used up. The sulphur containing
atoms in the course of reactions are:
This question has multiple correct options
( mathbf{A} )
[
left[begin{array}{c}
o \
o-S^{prime}-O \
_{o}
end{array}right]^{2}
]
B.
[
left[begin{array}{cc}
o & o \
O-S^{prime}-O-O-S^{prime}-O \
_{O} & _{O}^{prime}
end{array}right]^{2-}
]
( c )
[
left[begin{array}{c}
o \
O-underset{S}{S}-S \
o
end{array}right]^{2}
]
D.
[
left[begin{array}{cc}
o & o \
O-S & -S-S-S^{prime} \
rho & vdots \
o
end{array}right]^{2-}
]
12
701 In which of the following molecules, central atom involve expansion of octet?
A ( cdot P C l_{3} )
в. ( N C l_{3} )
c. ( C l F_{3} )
D. None of these
12
702 In which part of the atmosphere, ( boldsymbol{O}_{3} ) is
present?
A. Mesosphere
B. Stratosphere
c. Troposphere
D. Lithosphere
12
703 A radioactive element X decays to give two inert gases. X is :
( A cdot frac{238}{92} mathrm{U} )
B ( cdot frac{286}{88} ) Rа
( mathbf{C} cdot_{84}^{20 mathrm{p}} mathrm{o} )
D. ( frac{223}{87} ) Fr
12
704 How will you identify ( S O_{2}^{2-} ) in presence
of ( boldsymbol{C O}_{3}^{2-} ) ?
A. by odour.
B. color change
c. PH measurement.
D. weight measurement.
12
705 In one of the industrial processes used for the manufacture of
sodium hydroxide, a gas ( X ) is formed as
a by-product. The gas ( X ) reacts
with lime water to give a compound ( Y ) which is used as a bleaching agent in the chemical industry. Identify ( boldsymbol{X} ) and ( boldsymbol{Y} )
A. ( X ) is chlorine; ( Y ) is baking soda
B. ( X ) is chlorine; ( Y ) is bleaching powder
c. ( X ) is hydrogen; ( Y ) is potash
D. ( X ) is hydroge; ( Y ) is plaster of paris
12
706 Which of the following is not a green
house gas?
A. ( C O_{2} )
в. ( C H_{4} )
( c cdot O_{3} )
D. ( N_{2} X )
12
707 Question 10. Write a balanced equation for the hydrolytic reaction
PC1, in heavy water.
Reactions are same as those with water (H.0).
12
708 Zero group elements are known
( a s )
A. alkali metals
B. alkaline earth metals
C. transition metals
D. inert gases
12
709 Find the number of sesquioxide(s) from the following:
( boldsymbol{A l}_{2} boldsymbol{O}_{3}, quad boldsymbol{C}_{3} boldsymbol{O}_{2}, quad boldsymbol{C O}_{2}, quad boldsymbol{P b}_{2} boldsymbol{O}_{3} )
12
710 Prepare an acid salt from dil. ( boldsymbol{H}_{2} boldsymbol{S} boldsymbol{O}_{4} )
A ( cdot 2 H_{2} S O_{4}+2 C H_{3} C O O N a rightarrow 2 N a H S O_{4}+ )
( C H_{3} C O O H )
в. ( 2 H_{2} S O_{4}+C H_{3} C O O N a rightarrow 2 N a H S O_{4}+C H_{3} C O O H )
c. ( H_{2} S O_{4}+C H_{3} C O O N a rightarrow N a H S O_{4}+C H_{3} C O O H )
D. ( H_{2} S O_{4}+2 C H_{3} C O O N a rightarrow N a H S O_{4}+2 C H_{3} C O O H )
12
711 If one litre of air is passed repeatedly
over heated copper and magnesium till no further reduction in volume takes
place, the volume finally obtained would be approximately:
A. 800 m!
B. 200 m
c. ( 10 mathrm{ml} )
D. 20 m
12
712 Why is ( B F_{3} ) used as a catalyst in several industrial processes? 11
713 Action of ( boldsymbol{P C l}_{5} ) on ( boldsymbol{S O}_{2} ) chiefly yields:
A ( . P O C l_{3} )
в. ( P_{4} S_{3} )
c. ( s O_{2} C l_{2} )