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An aqueous solution of a metal ion (M) gives a yellow precipitate (B) with ammonium sulfide, (NH4)2S, and the precipitate remains insoluble in ammonium polysulfide, (NH4)2S2. Which cation is present in (M)?

1. CdS
2. SnS2
3. Cd2+
4. Sn2+

Correct answer: Cd2+

Solution

The formation of a yellow precipitate with ammonium sulfide indicates the presence of cadmium ions (Cd2+), as cadmium sulfide (CdS) is known for its characteristic yellow color. Additionally, the insolubility of the precipitate in ammonium polysulfide further confirms that the metal ion is cadmium, as it does not dissolve in this reagent.

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