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NAT II Physical Science Chemistry MCQs With Answers
Question # 1
Carbon atom holding halogen in aryl halides is
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sp
2
-hybridesed
sp
3
-hybridesed
sp-hybridesed
sp
3
d-hybridesed
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Question # 2
The acid used in lead storage cells is
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Phosphoric acid
Nitric acid
Sulphuric acid
Hydrochloric acid
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Question # 3
For most of the chemical reactions the rate of reaction
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Increase as the reaction proceeds
Decrease as the reaction proceeds
May increase or decrease during the reaction
Remains constant as the reaction proceeds
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Question # 4
Which of the following has greatest tendency to lose electron?
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F
Fr
S
Be
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Question # 5
Which is not a a colligative property?
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Osmotic pressure
Lowering of vapour pressure
Depression of freezing point
Elevation of boiling point
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Question # 6
One mole of gas refers to
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The number of molecules in one litre of gas
The number of molecules in one gram of gas
The number of molecules contained in 12 grams of
12
C isotope
The number of molecules in 22.4 litres of a gas at S.T.P.
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Question # 7
Octane number can be changed by
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Isomerisation
alkylation
Cyclisation
All of these
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Question # 8
Aryl halides are less reactive towards nucleophilic substitution reactions as compared to alkyl halides due to
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The formation of less stable carbonium ion
Resonance stabilization
Larger carbon -halogen bond
The inductive effect
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Question # 9
The addition of HBr is easiest with
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CH2 = CHCl
CICH = CHCl
CH3 - CH = CH2
(CH3)2 C = CH2
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Question # 10
When KClO
3
is heated, it decomposes into KCl and O
2. If some MnO2 is added, the reaction goes much faster because
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MnO
2
decomposes to give O
2
MnO
2
provide heat by reacting
Better contact is provided by MnO
2
MnO
2
acts as a catalyst.
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Question # 11
Which quantum number is sufficient to describe the electron is hydrogen
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ι
n
m
s
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Question # 12
White lead is
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Basic lead acetate
Acidic lead carbonate
Basic lead carbonate
Basic lead hydroxide
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Question # 13
Cyclone collector is used for minimizing
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Radioactive pollution
Air pollution
Noise pollution
Water pollution
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Question # 14
Which of the following possesses the highest melting point?
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Chlorobenzene
o- Dichlorobenzene
m-Dichlorobenzene
p-Dichlorobenzene
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Question # 15
Ozane is not
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An allotrope
A powerful oxidizing agent
Paramegnetic
a bent molecule
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Question # 16
The kinetic theory of gases predicts that total kinetic energy of a gaseous assemble depends on
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Pressure of the gas
Temperature of the gas
Volume of the gas
Pressure, temperature, and volume of the gas.
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