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  4. Which metal sulphide is soluble in excess NH3 solution?

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Q. Which metal sulphide is soluble in excess $NH_{3}$ solution?

NTA AbhyasNTA Abhyas 2020Equilibrium

Solution:

Here $Cr_{2}S_{3}$ is soluble in excess of ammonia while ZnS, MnS, FeS do not dissolve in excess $NH_{3}$ solution due to their low $K_{s p}$ values.

$Cr _{2} S _{3}+6 NH _{3} \rightleftharpoons\left[ Cr \left( NH _{3}\right)_{6}\right]^{3+}+ S ^{2-}( aq )$