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Which of the following compound gives a ...

Which of the following compound gives a black precipitate with ammonia solution?

A

`AgCl`

B

`HgCl_(2)`

C

`CuSO_(4)`

D

`Hg_(2)Cl_(2)`

Text Solution

Verified by Experts

The correct Answer is:
4
Ammonia forms a grey precipitate withmercurous chloride:
`Hg_(2)Cl_(2)+2NH_(4)OHrarrubrace(Hg+HgNH_(2)Cl)_("Grey")+NH_(4)Cl+2H_(2)O`
it forms a white precipitate with mercuric chloride:
`Hg_(2)Cl_(2)+2NH_(4)OHrarr underset("mercuric chloride")underset("Amido")(HgNH_(2)Cl)+NH_(4)Cl`
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