1.

To a solutionof a substance gradiual addition of ammoniumhydroxideresult in a black precipitate whichdoes notdissolve in excess of NH_(4)OH however when HCI is added to the original solution a white precipitate isformed .The solutioncontained

Answer»

LEAD salt
Silver salt
Mercurous salt
Copper salt

Solution :`HgCI_(2)` is white insoluble salt
`Hg_(2)CI_(2)+2NH_(4)OH rarr ubrace(Hg+HgO.Hg(NH_(2))CI)_("Black")`
`+NH_(4)CI +2H_(2)O`


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