Analytical ChemistryHard

Question

Black precipitate of copper sulphide dissolves in :

Options

A.KCN solution.
B.sodium sulphide solution.
C.sodium hydroxide.
D.boiling dilute (M) sulphuric acid.

Solution

2 CuS↓ + 8 CN- → 2 [Cu(CN)4]3- + S22-

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