Q.

To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of NH4OH. However, when HCI is added to the original solution, a white precipitate is formed. The solution contained

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a

Lead salt

b

Silver salt

c

Mercurous salt

d

Copper salt

answer is C.

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Detailed Solution

Hg2Cl2 is white insoluble salt
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To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of NH4OH. However, when HCI is added to the original solution, a white precipitate is formed. The solution contained