Question

Which of the following sulphides has the lowest solubility product?

• A. FeS
• B. MnS
• C. PbS
• D. ZnS

Answer 1

The correct option is C PbS

• Answer -

PbS has the lowest solubility product.

• Explanation -

PbS has the lowest solubility product of all the sulphides given in the question. Pb2+ cation belongs to group-2 of salt analysis sulfides of group-2 and has lower solubility products.

For given options, solubility products are -

$-K_{sp}\left(FeS\right)={10}^{-18}$

$-K_{sp}\left(PbS\right)={10}^{-28}$

$-K_{sp}\left(ZnS\right)={10}^{-23}$

$-K_{sp}\left(MnS\right)={10}^{-11}$

From this data, PbS has the lowest solubility product.