Analytical ChemistryHard

Question

A suspension containing insoluble substances ZnS, MnS, HgS, Ag2S and FeS, is treated with 2N HCl. On filtering, the filtrate contains appreciable amounts of which one of the following?

Options

A.Zinc and mercury
B.Silver and iron
C.Manganese and mercury
D.Zinc, manganese and iron

Solution

Ag2S + 2HCl → AgCl ↓ + 2H2S ; HgS is also insoluble in 2N HCl so silver and mercury do not pass into filtrate while ZnS, MnS and FeS dissolve in 2N HCl forming their soluble chlorides and thus pass into filtrate.

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