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Question

A solution which is 10-3 M each in Mn2+, Fe2+, Zn2+ and Hg2+ is treated with 10-16 M sulphide ion. If Ksp of MnS, FeS, ZnS and HgS are 10-15, 10-23, 10-20 and 10-54 respectively, which one will precipitate first?


A

FeS

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B

HgS

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C

ZnS

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D

MgS

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Solution

The correct option is B

HgS


precipitation will occur only when

Qip>Ksp

Therefore,HgS will be precipitated first.


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