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An aqueous solution of compound 'A' give...

An aqueous solution of compound `'A'` gives white precipitate with `2M HCl`.The precipitate becomes black on addition of aqueous `NH_(3)` due to formation of `'B'`.`'B'` dissolves in aquaregia. `'A'` and `'B'` are:

A

`Hg^(2+)` and `HgCI_(2)`

B

`Hg_(2)^(2+)` and `Hg_(2)CI_(2)`

C

`Hg^(2+)` and `Hg(NH_(2))CI+Hg`

D

`Hg_(2)^(2+)` and `Hg(NH_(2))CI+ Hg`

Text Solution

Verified by Experts

The correct Answer is:
D
`underset((A))(Hg_(2)^(2+)) overset(HCI)rarr underset(("White ppt"))(Hg_(2)CI darr) overset(aq.NH_(3))rarr ubrace(Hg+Hg(NH_(2))CIdarr)_("Black"(B))`
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