Passing $\mathrm{H}_{2}\mathrm{~S}$ gas into a mixture of $\mathrm{Mn}^{2+}$, $\mathrm{Ni}^{2+}$, $\mathrm{Cu}^{2+}$ and $\mathrm{Hg}^{2+}$ ions in an acidified aqueous solution precipitates

JEE Advanced · 2011 · 10 Apr 2011 · Paper 2 · Practical and Analytical Chemistry

Passing

H_{2} S

gas into a mixture of

Mn^{2 +}

Ni^{2 +}

Cu^{2 +}

and

Hg^{2 +}

ions in an acidified aqueous solution precipitates

(A)CuS and HgS✓ Correct
(B)MnS and CuS
(C)MnS and NiS
(D)NiS and HgS

Answer: (A)

Solution

In acidified aqueous solution,

H_{2} S

precipitates sulfides of Group II cations (those with very low solubility products). Among the given ions,

Cu^{2 +}

and

Hg^{2 +}

form highly insoluble sulfides (

CuS

and

HgS

) even in acidic medium.

Mn^{2 +}

and

Ni^{2 +}

form sulfides that are more soluble and require basic/neutral conditions to precipitate.

Therefore, only

CuS

and

HgS

precipitate in acidic medium.

JEE Advanced · 2011 · 10 Apr 2011 · Paper 2 · Single correct option

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