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What is yellow ammonium sulphide? Why is yellow ammonium sulphide and not ordinary ammonium sulphide used for the separation of IIA and IIB sub – group?

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Formula for Yellow Ammonium Sulphide (NH4)2S. It is a mixture of ammonium polysulphides.
The group IIA and IIB are separated on the basis of their solubility in Yellow Ammonium Sulphide.
The group IIA elements are insoluble whereas group IIB elements are soluble in Yellow Ammonium Sulphide.

Final answer :The group IIA and IIB are separated on the basis of their solubility in Yellow Ammonium Sulphide

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