JAMB Chemistry 2021 Objective — Question 29
Question 29 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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The paper will turn black due to the formation of lead(ii) sulphide. A piece of filter paper moistened with lead(ii) ethanoate turns black when dropped into which gas?
- A. SO₂
- B. H₂SCorrect
- C. SO₃
- D. HCl
Explanation
H₂S + Pb(CH₃COO)₂ → PbS↓ (black) + 2CH₃COOH. The black precipitate of lead(ii) sulphide forms when lead ethanoate paper contacts hydrogen sulphide gas.
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