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HgCl(2) and I(2) both when dissolved in ...

`HgCl_(2)` and `I_(2)` both when dissolved in water containing `I^(-)` ions the pair of species formed is:

A

`Hg_(0)I_(4)I^(-)`

B

`HgI_(2)`, `I_(3)^(-)`

C

`HgI_(2)`, `I^(-)`

D

`HgI_(4)^(2-)`, `I_(3)^(-)`

Text Solution

Verified by Experts

The correct Answer is:
D
In a solution containing `HgCl_(2)`, `I_(2)` and `I^(-)` , both `HgCl_(2)` and `I_(2)` compete for `I^(-)`.
Since formation constant of `[HgI_(4)]^(2-)` is `1.9xx10^(30)` which is very large as compared with `I_(3)(K_(r )=700)`
`:.I^(-)` will preferentially combine with `HgCl_(2)`.
`HgCl_(2)+2I to underset("Red ppt")(Hgl_(2) darr)+2Cl^(-)`
`Hgl_(2)+2I^(-) to underset("soluble")[Hgl_(4)]^(2-)`
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