WAEC Chemistry 2019 Objective — Question 47

Question 47 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

The method used to collect a gas in the laboratory depends on its I. boiling point II. Density III. Smell IV. Solubility in water.

A. I and II only
B. II and IV onlyCorrect
C. III and IV only
D. I, II, III and IV

Explanation

The method of gas collection depends on the gas's density (for upward/downward delivery) and its solubility in water (whether it can be collected over water) — i.e. II and IV only.

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