Chemistry Past Paper Questions

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Q 141:) In the lime kiln the reaction goes to completion because of: CaCO3⟶ CaCO + CO2
A
CaO is more stable than CaCO3
B
CaO is not dissociated
C
Low temperature
D
Co2 escapes continuously
Lahore, 2019
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Q 142:A reverse reaction is one:
A
Which proceeds from left to right
B
In which reactants react to form products
C
which slow down gradually
D
which speeds up gradually
Lahore, 2019
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Q 143:About 99% atmosphere’s mass lies within:
A
35km
B
30km
C
15km
D
11km
Lahore, 2019
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Q 144:Atomic number of element was discovered by:
A
H. Moseley
B
Newlands
C
Thomson
D
Crooks
Lahore, 2019
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Q 145:Boiling point of sodium chloride is:
A
800°C
B
1013°C
C
1213°C
D
1413°C
Lahore, 2019
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Q 146:Concentration is a ratio of:
A
Solvent to solute
B
Solute to solution
C
Solvent to solution
D
Solute to solvent
Lahore, 2019
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Q 147:Which one of the following is liquid in solid solution?
A
butter
B
fog
C
opal
D
sugar in water
Gujranwala, 2019
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Q 148:Which one of the following is non-electrolyte?
A
Solution of acid
B
solution of sugar
C
solution of NaOH
D
solution of Ca(OH)2
Gujranwala, 2019
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Q 149:Which one of the following is a water soluble vitamin?
A
D
B
C
C
E
D
K
Gujranwala, 2019
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Q 150:Which one of the following is Lewis base?
A
NH3
B
BF3
C
H+
D
AlCl3
Gujranwala, 2019
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Total MCQs: 1548Page 15 of 155
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