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NAT II Physical Science Chemistry MCQs With Answers
Question # 1
A clathrate may be defined as a
Choose an answer
Cage compound
Liquid crystal
Mixture
Solid solution
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Question # 2
The unit rate of a reaction can be increased in general by all the factors except by
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Using a catalyst
Increasing temperature
Increasing the activation energy
Increasing the conc. of reactants
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Question # 3
In cold countries ethylene glycol is added to water in radiators of cars during winter. It results in
Choose an answer
Lowering in b.pt.
Reducing viscity
Reducing specific heat
Lowering in freezing pt.
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Question # 4
Aryl halides are less reactive towards nucleophilic substitution reactions as compared to alkyl halides due to
Choose an answer
The formation of less stable carbonium ion
Resonance stabilization
Larger carbon -halogen bond
The inductive effect
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Question # 5
The treatment of benzene with isobutene in the presence of sulphuric acid give
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isobutyl benzene
tert-Butyl benzene
n- Butyl benzene
no reaction
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Question # 6
Iron, once dipped in concentrated H
2
SO
4
, does not displace copper from copper sulphates solution, because
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It is less reactive than copper
A layer of sulphates is deposited on it
An inert layer of iron oxide is deposited on it.
All valence electrons of iron are consumed.
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Question # 7
Which of the following units represents largest amount of energy?
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Calorie
Joule
Erg
Electron vol.
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Question # 8
In Friedal-Craft's alkylation besides AlCl
3
the other reactants are
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C6H6 + NH3
C6H6 + CH4
C6H6 + CH3Cl
C6H6 + CH3COCl
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Question # 9
The rate at which a substance reacts depends on its
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Atomic weight
Equivalent weight
Molecular weight
Active mass
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Question # 10
Which for the following has greatest reducing power?
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Hl
HBr
HCl
Hl
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Question # 11
Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?
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Chlorination, nitration, reduction
Nitration, Chlorination, reduction
Nitration, reduction, chlorination
Nitration, reduction, acylation, chorination, hydrolysis
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Question # 12
Benezene is obtained by fractional distillation of
Choose an answer
Heavy oil
Anthracene oil
Middle oil
Light oil
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Question # 13
Variable valency is generally exhibited by
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Normal elements
Transition elements
Metallic elements
None of these.
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Question # 14
Which of the following mineral does not contain Al?
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Cryolite
Mica
Feldspar
Fluorspar
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Question # 15
Inert pair effect plays an important role in case of
Choose an answer
F
Al
Si
Tl
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