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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 1:

A mixture of sugar and sulphur can be separated by

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A Dissolution in water, evapouration and filtration
B Filtration, evaporation and dissolution in water
C Dissolution in water, filtration and evaporation
D Evaporation, dissolution in water and filtration

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Question 2:

A mixture of sugar and sulphur can be separated by

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A Dissolution in water, evapouration and filtration
B Filtration, evaporation and dissolution in water
C Dissolution in water, filtration and evaporation
D Evaporation, dissolution in water and filtration

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Question 3:

Which of the following is a physical change?

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A Freezing ice cream
B Dissolving calcium in water
C Burning kerosene
D Exposing white phosphorus to air

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Question 4:

The percentage of water of crystallization in ZnSO₄.7H₂O is
[Zn = 65, S = 32, O = 1, H = 1]

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A 33%
B 44%
C 55%
D 87%

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Question 5:

0.0075 mole of calcium trioxocarbonate (IV) is added to 0.015 mole of a solution of hydrochloric acid. The volume of gas evolved at s.t.p is
[Molar volume of a gas at s.t.p = 22.4 dm³]

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A 224cm³
B 168cm³
C 112cm³
D 100cm³

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