Analytical ChemistryHard

Question

Original solution of salt or mixture should not be prepared in concentrated HNO3 because it :

Options

A.is highly corrosive.
B.oxidises H2S to S in IInd group.
C.undergoes disproportionation reaction.
D.converts sulphide of Ba, Sr and Pb into insoluble sulphates.

Solution

(B) 2HNO3 → 2NO2 + H2O + [O] ; H2S + [O] → H2O + S ↓
(D) 2HNO3 → 2NO2 + H2O + [O] ; PbS + [O] → PbSO4 ↓

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