IIT-JEE 2011 · Paper 2 · Chemistry Q3

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ChemistrySingle correct+3 / -1Question 3 of 60

Passing $\ce{H2S}$ gas into a mixture of $\ce{Mn^{2+}}$ , $\ce{Ni^{2+}}$ , $\ce{Cu^{2+}}$ and $\ce{Hg^{2+}}$ ions in an acidified aqueous solution precipitates

CuS and HgS

MnS and CuS

MnS and NiS

NiS and HgS

Answer and worked solution

Official answer: A

Group II. In acid the sulphide ion concentration is very low, so only the sulphides with the smallest $K_{sp}$ precipitate: CuS and HgS. MnS and NiS need ammoniacal $\ce{H2S}$ (group IV).

(A)

Topics:Cation analysis

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IIT-JEE 2011 · Paper 2, Chemistry question 3