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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 1:

A mixture of sand, ammonium chloride and sodium chloride is best separated by?

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A Sublimation followed by addition of water and filteration
B Sublimation followed by addition of water and evaporation
C Addition of water followed by filtration and sublimation
D Addition of water followed by crystallization and sublimation

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Question 2:

A pure solid usually melts?

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A Over a wide range of temperature
B Over a narrow range of temperature
C At a lower temperature than the impure one
D At the same temperature as the impure one

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Question 3:

At the same temperature and pressure, 50 cm³ of nitrogen gas contains the same number of molecules as?

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A 25 cm³ of methane
B 40 cm³ of hydrogen
C 50 cm³ of ammonia
D 100 cm³ of chlorine

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Question 4:

8g CH₄ occupies 11.2 dm³ at s.t.p. What volume would 22 g of CH₃CH₃ occupy under the same condition?
(C = 12, H = 1)

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A 3.7 dm³
B 11.2 dm³
C 22.4 dm³
D 33.6 dm³

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Question 5:

To what temperature must a gas 273 K be heated in order to double both its volume and pressure?

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A 298 K
B 546 K
C 819 K
D 1092 K

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