Q.

Which of the following salt is least soluble ?

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a

Bi2S3 (Ksp = 10-17)

b

CuS (Ksp  = 10-36)

c

MnS (Ksp = 10-15)

d

Ag2S(Ksp = 10-50)

answer is B.

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Detailed Solution

By observing (i), (ii), (iii) and (iv), the solubility of CuS(s) will be the least.
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