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When sodium thiosulphate reacts with silver nitrate, the black precipitate produced is

1. silver thiosulphate (Ag2S2O3)
2. silver sulphide (Ag2S)
3. silver sulphate (Ag2SO4)
4. silver sulphite (Ag2SO3)

Correct answer: silver sulphide (Ag2S)

Solution

The reaction between sodium thiosulphate and silver nitrate produces silver sulphide (Ag2S) as a black precipitate, which is a characteristic result of the interaction between silver ions and sulfide ions.

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