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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

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

B

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

C

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

D

`Hg_(2)I_(2),I^(-)`

Text Solution

Verified by Experts

The correct Answer is:
C
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_(f)=700)`
`:.` `I^(-)` will preferentially combine with `HgCl_(2)` .
`HgCl_(2) +2I^(-) to underset("Red ppt")(HgI_(2) darr)+2Cl^(-)`
`HgI_(2)+2I^(-) to underset("soluble")([HgI_(4)]^(2-))`
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