JEE Main Chemistry question

Chemistry Principles Related to Practical Chemistry JEE Main

Passing gas into a mixture of , , and ions in an acidified aqueous solution precipitates [IIT JEE 2011]

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

Answer: (A)

Solution

In acidic medium, is kept very low by the common ion, so only the most insoluble (Group II) sulfides precipitate:

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Question ID VK-135646