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Which of the following metal sulphides has maximum solubility in water?

(a) HgS $K_{sp} = 10^{-54}$
(b) CdS $K_{sp} = 10^{-30}$
(c) FeS $K_{sp} = 10^{-20}$
(d) ZnS $K_{sp} = 10^{-22}$
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Answer: FeS $K_{sp} = 10^{-20}$
More the $K_{sp}$ more is the solubility as all sulphides are of the same type (AB). Thus, FeS with $K_{sp} = 10^{-20}$ is most soluble.
answered Feb 1, 2014 by mosymeow_1

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