Post-UTME Chemistry 2018 Objective — Question 19
Question 19 of 21 from the Post-UTME Screening (Post-UTME) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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A salt soluble in water, gives a black precipitate with hydrogen sulphide and a deep blue colour with aqueous ammonia. The salt contains
- A. Cu 2+Correct
- B. Ag +
- C. Pb 2+
- D. Fe 2+
Explanation
Cu2+ forms a black CuS precipitate with H2S, and a characteristic deep blue complex ion with excess aqueous ammonia.
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