WAEC Chemistry 2010 Objective — Question 22
Question 22 of 49 from the West African Examinations Council (WAEC) Chemistry 2010 Objective paper, with the correct answer and a full explanation.
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Which of the following gases can be controlled by the set-up illustrated below? [Gas → Delivery tube → Gas jar]
- A. A. H2
- B. B. HClCorrect
- C. C. NH3
- D. D. N2
Explanation
The set-up shows a gas being collected by downward delivery. A gas is collected by downward delivery if it is denser than air and collected by upward delivery if it is less dense than air. HCl (M.M.=36.5) is denser than air (M.M.≈28.8), so it is collected by downward delivery.
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