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NAT II Physical Science Chemistry MCQs With Answers
Question # 1
Water (H
2O
) is liquid while hydrogen sulphide (H
2
S) is a gas because
Choose an answer
Water has higher molecular weight
Hydrogen sulphide is a weak acid
Sulphure has high electronegativity than oxygen
Water molecules associate through hydrogen
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Question # 2
Which of the following method is most appropriate for the manufacture of methane?
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By reduction of CH2SL2
Wurtz reaction
Liquification of natural gas
None of these
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Question # 3
Which is the most volatile compound?
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HI
HCl
HBr
HF
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Question # 4
A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution?
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12.7 gm
15.9 gm
31.8 gm
63.5 gm
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Question # 5
Bleaching action of bleaching powder is due to the liberation of
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O
2
OCl
-
Cl
2
Cl
-
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Question # 6
Which of the following statements is correct with respect to the property of elements with increase in atomic number in the carbon family (group 14)?
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Their metallic character decreases
The stability of +2 oxidation state increases
Their ionization energy increases
Their atomic size decreases
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Question # 7
Evaporation of water is
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An exothermic change
an endothermic change
A process where no heat changes occur
A process accompanied by chemical reaction.
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Question # 8
The percentage of nitrogen in urea is
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46
60
70
80
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Question # 9
Which one is the property of an ideal solvent?
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Should be expensive
It should react chemically with the solute
Impurities should crystallize along with the solute
Should be safe to use
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Question # 10
Which of the following alkali metal hydroxides is the strongest base?
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LiOH
NaOH
KOH
CsOH
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Question # 11
The formula to calcium cyanamide is
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Ca(CN)
2
CaC
2N
CaNCN
CaCHNH
2
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Question # 12
Which of the following oxides is peroxide?
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Na
2
O
2
MnO
2
BaO
SO
2
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Question # 13
Pollutant of automobile exhausts that affects nervous system/produces mental diseases is
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Mercury
Lead
Nitrogen oxide
Sulphur oxide
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Question # 14
Red lead is
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PbO
Pb
3
O
4
PbO
2
Pb
4
O
3
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Question # 15
2 g of oxygen contains number of atoms equal to that in
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0.5 g of hydrogen
4 g of sulphur
7 g of nitrogen
2.3 g of sodium
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Question # 16
Which of the following has no tin in its composition?
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Solder
Bronze
Brass
Tin stone
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