Chemistry Past Paper Questions

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Q 771:Oxidation of alkenes produces:
A
Glyoxal
B
Glycol
C
Oxalic acid
D
Formic acid
Sargodha, 2018
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Q 772:pH of neutral solution is:
A
6
B
7
C
8
D
14
Sargodha, 2018
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Q 773:Potable water on earth is only_________ of total water.
A
0.6%
B
0.2%
C
0.4%
D
2.1%
Sargodha, 2018
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Q 774:Specific heat capacity of water is:
A
4.2 kJ g-1 K-1
B
4.2 J g-1 K-1
C
2.4 kJ g-1 K-1
D
2.4 J g-1 K-1
Sargodha, 2018
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Q 775:Temporary hardness is because of:
A
MgSO4
B
MgCO₃
C
CaCO3
D
Ca(HCO3)2
Sargodha, 2018
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Q 776:The boiling range of petroleum ether is:
A
170-250oC
B
30-80oC
C
20-170oC
D
80-170oC
Sargodha, 2018
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Q 777:The colour of I2 gas is:
A
Blue
B
Green
C
Purple
D
Red
Sargodha, 2018
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Q 778:The conjugate base of sulphuric acid is:
A
SO32-
B
SO2-
C
HSO4-
D
HSO3-
Sargodha, 2018
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Q 779:The formula of stearic acid is:
A
C17H35COOH
B
C17H33COOH
C
C17H37COOH
D
C17H31COOH
Sargodha, 2018
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Q 780:The given reaction goes to completion because of CaCO3 →CaO + CO2
A
High temperature
B
CaO is morre stable than CaCO3
C
CO2 escapes continuously
D
CaO is not dissociated
Sargodha, 2018
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Total MCQs: 1548Page 78 of 155
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