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Question

If 0.1 M HCI is mixed in the solution containing only 0.1MCd2+ ions and saturated with H2S, then [Cd2+] remaining in the solution after CdS stops to precipitate is

A
108
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B
8.2×109
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C
5.6×106
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D
5.6×1010
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Solution

The correct option is B 108
K1K2=[H]2[S2][H2S][S2]min=1020M
[Cd2+]allowed=Ksp(CdS)[S2]salt=108M

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