1.

To a solution of substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of NH_(4)OH. However, when HCl is added to the original solution, a white precipitate is formed. The solution contained

Answer»

Lead salt
Silver salt
Mercurous salt
Copper salt

Solution :`Hg_(2)Cl_(2)` is white INSOLUBLE salt.
`Hg_(2)Cl_(2)+2NH_(4)OH to Hg+HGunderset("BLACK")ubrace((NH_(2))Cl+NH_(4)Cl)+2H_(2)O`


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