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6.2. Equilibrium - II (icon Equilibrium) — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry6.2. Equilibrium - II (icon Equilibrium)1 Mark
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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