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Preparations and Reactions of Sodium Oxide

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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 K_sp 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
Q_ip>K_sp
Therefore,HgS will be precipitated first.

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