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NAT II Physical Science Chemistry MCQs With Answers
Question # 1
Oleum is
Choose an answer
Castor oil
Oil of vitriol
Fuming of H
2
SO
4
None of them
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Question # 2
Acid rains are produced by
Choose an answer
Excess NO
2
and SO
2
from burning fossil fuels
Excess production of NH
3
by industry and coal gas
Excess release of carbon monoxide by incomplete combustion
Excess formation of CO
2
by combustion and animal respiration
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Question # 3
All the naturally occurring processes proceed spontaneously in a direction which lead to
Choose an answer
Decrease of entropy
Increase of enthalpy
Increase of free energy
Decrease of free energy
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Question # 4
Carbon atom holding halogen in aryl halides is
Choose an answer
sp
2
-hybridesed
sp
3
-hybridesed
sp-hybridesed
sp
3
d-hybridesed
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Question # 5
The substance used as a smoke screen in warfare is
Choose an answer
SiCl
4
PH
3
PCl
5
Acetylene
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Question # 6
The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water in
Choose an answer
-1.86
°C
-3.72
°C
+1.86
°C
+3.72
°C
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Question # 7
The weight of 11.2 litres of CO
2
at S.T.P. would be
Choose an answer
88 g
44 g
32 g
22 g
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Question # 8
The unit rate of a reaction can be increased in general by all the factors except by
Choose an answer
Using a catalyst
Increasing temperature
Increasing the activation energy
Increasing the conc. of reactants
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Question # 9
The treatment of benzene with isobutene in the presence of sulphuric acid give
Choose an answer
isobutyl benzene
tert-Butyl benzene
n- Butyl benzene
no reaction
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Question # 10
The pure crystalline substance on being heated gradually first forms turbid liquid at constant temperature and still at higher temperature turbidity completely disapp-ears. The behaviour is a characteristic of substance forming
Choose an answer
Allotropic crystal
Liquid crystals
Isomeric crystals
Isomorphous crystals
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Question # 11
Bond angle is minimum for
Choose an answer
H
2
O
H
2
S
H
2
Se
H
2
Te
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Question # 12
By using the fluted filter paper rate of filtration is
Choose an answer
Increased
Decreased
Filtration is constant
Having no effect
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Question # 13
Enzymes are
Choose an answer
Proteins
Minerals
Oils
Fatty acids
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Question # 14
Natural fertilizer provides potassium in the form of K
2
O (potash)
Choose an answer
1.5 kg
3 kg
4.5 kg
6.5 kg
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Question # 15
What happens when CCl
4
is treated with AgNO
3
solution?
Choose an answer
NO
2
will be evolved
A white ppt. of AgCl will form
CCl
4
will dissolve in AgNO
3
solution
Nothing will happen
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Question # 16
Which of the following statements is most appropriate about effective nuclear charge? It depends upon
Choose an answer
The shielding constant
The atomic number
The charge on the nucleus
Both the nuclear charge and the shielding
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