Chemistry Past Paper Questions

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Q 251:Just above the earth's surface is:
A
Meosphere
B
Stratosphere
C
Troposphere
D
Thermosphere
Rawalpindi, 2019
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Q 252:Just above the surface of earth there is present:
A
Meosphere
B
Stratosphere
C
Troposphere
D
Thermosphere
Rawalpindi, 2019
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Q 253:Reduction of Alkyl halids take place in the presence of:
A
Cu/HCl
B
Zn/HCl
C
Na/HCl
D
Mg/HCl
Rawalpindi, 2019
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Q 254:Sum of pH and pOH of solution at 25oC is always:
A
12
B
10
C
14
D
8
Rawalpindi, 2019
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Q 255:Swimming pools are cleaned by which process?
A
Chlorination
B
Bromination
C
Hydrogenation
D
Nitration
Rawalpindi, 2019
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Q 256:Temporary hardness of water is removed by adding:
A
Quick lime
B
Slaked lime
C
Limestone
D
Sodium Carbonate
Rawalpindi, 2019
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Q 257:The acid used for food preservation is:
A
Sulphuric acid
B
Nitric acid
C
Benzoic acid
D
Hydrochloric acid
Rawalpindi, 2019
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Q 258:Milk of Magnesia is an example of:
A
a solution
B
a colloid
C
Saturated solution
D
Suspension
Rawalpindi, 2019
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Q 259:In the redox reaction between Zn and HCl, the oxidizing agent is:
A
Zn
B
H+
C
Cl-
D
H2
Rawalpindi, 2019
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Q 260:It is an example of : 2ZnO + C ------------> 2Zn + CO2
A
Oxidation
B
Reduction
C
Redox
D
Electrolysis
Rawalpindi, 2019
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Total MCQs: 1548Page 26 of 155
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