JAMB Chemistry 2021 Objective — Question 6
Question 6 of 41 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2021 Objective paper, with the correct answer and a full explanation.
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Which of the following gases cannot be collected by downward delivery?
- A. Cl₂
- B. NH₃Correct
- C. SO₂
- D. H₂S
Explanation
Downward delivery collects gases denser than air. NH₃ (M.M. = 17) is less dense than air (M.M. ≈ 29), so it is collected by upward delivery. Cl₂, SO₂ and H₂S are all denser than air.
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