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A solution containing Mn^(2+),Fe^(2+),Zn...

A solution containing `Mn^(2+),Fe^(2+),Zn^(2+)andHg^(2+)` with a molar concentration of `10^(-3)` M each is treated with `10^(-16)M` sulphide ion solution. Which ion will precipitate first if `K_(sp)` of MnS, FeS, ZnS and HgS are `10^(-15),1-^(-23),10^(-20)and10^(-54)` respectively ?

A

`FeS`

B

`MgS`

C

`HgS`

D

`ZnS`

Text Solution

Verified by Experts

The correct Answer is:
C
Precipitation occurs when the ionic product is greater than the solubility product. Fo the similar formula, if the solubility product is smaller, precipitation must occur earlier. Of the given choice, `HgS` has the least value of the solubility products so its precipitation occurs erliest.
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