Chemistry Past Paper Questions

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Q 1431:Petroleum fraction having composition C7 to C10 is called:
A
Petroleum gas
B
Petroleum ether
C
Kerosene oil
D
Gasoline or petroleum
Rawalpindi, 2016
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Q 1432:Temporary hardness of water is because of
A
MgCO3
B
MgSO4
C
Ca(HCO3)2
D
CaCO3
Rawalpindi, 2016
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Q 1433:The reactions which have comparable amounts of reactants and products at equilibrium state have:
A
very small value of Kc
B
very large of Kc
C
moderate value of Kc
D
None of these
Rawalpindi, 2016
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Q 1434:Which gas protects the Earth's surface from ultra violet radiations?
A
CO2
B
CO
C
N2
D
O3
Rawalpindi, 2016
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Q 1435:The symbol of potassium is
A
P
B
Potassium
C
K
D
Ko
Rawalpindi, 2016
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Q 1436:The maximum number of electrons can be present in K shell is
A
4
B
6
C
2
D
10
Rawalpindi, 2016
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Q 1437:The most abundant element occurring in the ocean is:
A
Oxygen
B
hydrogen
C
Nitrogen
D
Silicon
Rawalpindi, 2016
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Q 1438:The most common example of corrosion is:
A
Chemical Decay
B
Rusting of Iron
C
Rusting of aluminium
D
Rusting of tin
Rawalpindi, 2016
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Q 1439:One atmospheric pressure is equal to how many Pascals?
A
10325
B
101325
C
90325
D
909325
Rawalpindi, 2016
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Q 1440:One of the following is a non-electrolyte.
A
Sodium
B
Benzene
C
Potassium
D
Calcium
Rawalpindi, 2016
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Total MCQs: 1548Page 144 of 155
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