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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 1:

Which of the following is an example of a mixture?

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A Common salt
B Blood
C Sand
D Washing soda

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Question 2:

Which of the following is an example of a mixture?

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A Common salt
B Blood
C Sand
D Washing soda

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Question 3:

Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V)
[Ca = 40, N = 14, O = 16]

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A 8.5%
B 13.1%
C 17.1%
D 27.6%

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Question 4:

The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the

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A Water vapour in the air around the bottle gains some energy from the bottle
B Temperature of the milk drops as it loses heat into the surroundings
C Saturated vapour pressure of the milk is equal to the atmospheric pressure
D Water vapour in the air around the bottle loses some of its energy to the bottle

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Question 5:

The volume of a given gas is V cm³P mm Hg. what is the new volume of the gas if the pressure is reduced to half at constant temperature

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A 4 V cm³
B 2 V cm³
C V/2 cm³
D V cm³

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