Q22 / 220 · NTA Abhyas (NEET) 2020 · Chemistry · Ionic Equilibrium

Which metal sulphide is soluble in excess $N H_{3}$ solution?

A
ZnS
B
MnS
C
FeS
Correct answer
D
$C r_{2} S_{3}$

Solution

Here

C r_{2} S_{3}

is soluble in excess of ammonia while ZnS, MnS, FeS do not dissolve in excess

N H_{3}

solution due to their low

K_{s p}

values.

C r_{2} S_{3} + 6 N H_{3} ⇌ [C r (N H_{3})_{6}]^{3 +} + S^{2 -} (a q)

Hence, the correct answer is option: 'D'.

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