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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 `Hg Cl_(2)`

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
D
(A)`Hg_(2)^(2+) overset("Dil HCl")toHg_(2)Cl_(2)darr("white")overset(NH_(3)(aq))to ubrace(Hgdarr("black")+Hg(NH_(2))Cldarr("white"))_(Black).`
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