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Which formula represents yellow ammonium sulphide?

1. (NH4)2S8
2. (NH4)2S
3. (NH4)2Sx
4. (NH4)2S4

Correct answer: (NH4)2Sx

Solution

Yellow ammonium sulphide is an ammonium polysulphide, written generally as (NH4)2Sx, where the polysulphide chain (x sulphur atoms) gives the yellow colour. Plain (NH4)2S is colourless.

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