Which metal sulphide is soluble in excess NH_3 solution ? - Vidyadip

MCQ

Which metal sulphide is soluble in excess $NH_3$ solution ?

A
$ZnS$
B
$MnS$
C
$FeS$
✓
$Cr_2S_3$

✓

Answer

Correct option: D.

$Cr_2S_3$

d
$ZnS,\,MnS,\,FeS$ do not dissolve in excess $NH_3$ solution due to their low $K_{sp}$ values.

$C{r_2}{S_3} + 6N{H_3}\, \rightleftharpoons \,{[Cr{(N{H_3})_6}]^{3 + }}\, + \,{S^{2 - }}(aq.)$

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