The pair(s) of ions where BOTH the ions are precipitated upon passing H_2S gas in presence of dilute HCl, is(are)

JEE Advanced 2015 Chemistry question

The pair(s) of ions where BOTH the ions are precipitated upon passing gas in presence of dilute HCl, is(are)

(A),
(B),
(C), Correct
(D), Correct

Answer: (C),(D)

Solution

In dilute HCl the common-ion effect keeps very low, so only sulphides with very small (group II cations: , , , , , As, Sb, Sn) precipitate. (C) CuS and PbS both precipitate: correct. (D) HgS and

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Question ID VK-026456