Passing H_2S gas into a mixture of Mn^ 2+ , Ni^ 2+ , Cu^ 2+ and Hg^ 2+ ions in an acidified aqueous solution precipitates

JEE Advanced 2011 Chemistry question

Passing gas into a mixture of , , and ions in an acidified aqueous solution precipitates

(A)CuS and HgSCorrect
(B)MnS and CuS
(C)MnS and NiS
(D)NiS and HgS

Answer: (A)

Solution

In acidic solution the dissociation of is suppressed by the common ion , so is very low. Only sulphides with extremely small solubility products (group II of qualitative analysis: CuS,

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Question ID VK-025946