Analytical ChemistryHard

Question

To a solution of a substance, gradual addition of ammonium hydroxide results in a brownish black precipitate which does not dissolve in excess of NH4OH. However, when KI (not in excess) is added to the original solution, a green precipitate is formed. The solution contained :

Options

A.Lead salt
B.Silver salt
C.Mercurous salt
D.Copper salt.

Solution

Hg2Cl2 + 2NH3 →  + NH4Cl
Hg22+ + 2I- →  Hg2I2 ↓ (green)

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