Chemistry Past Paper Questions

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Q 721:Pitch is a black Residue of
A
Coal gas
B
Coal
C
Coal tar
D
Coke
Sahiwal, 2018
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Q 722:The gas prepared by Haber's process is:
A
CO2
B
NH3
C
SO3
D
SO2
Sahiwal, 2018
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Q 723:The general formula of alkyl radical is:
A
CnH2n+1
B
CnH2n-2
C
CnH2n
D
CnH2n+2
Sahiwal, 2018
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Q 724:The other name of alkanes is:
A
Acetylene
B
Paraffins
C
Olefins
D
Halogens
Sahiwal, 2018
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Q 725:Thousands of amino acids polymerize to form:
A
Vitamins
B
Lipids
C
Proteins
D
Carbohydrates
Sahiwal, 2018
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Q 726:Water dissolves non-ionic compound by:
A
Ion-ion forces
B
Hydrogen bonding
C
ion dipole forces
D
dipole-dipole forces
Sahiwal, 2018
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Q 727:The oxidation number of Cr in K2 Cr2 O7 is
A
+2
B
+6
C
+7
D
+8
Sahiwal, 2018
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Q 728:The non metals are generally soft but which one of the following is extremely hard
A
Graphite
B
Phosphorus
C
Diamond
D
Iodine
Sahiwal, 2018
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Q 729:The common example of corrosion is
A
corrosion of copper
B
corrosion of iron
C
corrosion of tin
D
corrosion of aluminium
Sahiwal, 2018
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Q 730:The component of which of the following can be separated by physical methods
A
Mixture
B
Element
C
Compounds
D
Radicals
Sahiwal, 2018
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Total MCQs: 1548Page 73 of 155
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