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Question

Solubility product of a sulphide MS is 3 × 1025 and that of another sulphide

NS is 4 × 1040. In ammonia solution


A

Only NS gets precipitated

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B

Only MS gets precipitated

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C

No sulphide precipitates

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D

Both sulphides precipitate

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Solution

The correct option is D

Both sulphides precipitate


The concentration of S2 ions in group II is lowered by maintaining acidic

medium in the presence of NH4Cl. The ionization of H2S is supressed due

to common ion effect. So the ionic product is less than solubility product.


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