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Q.

A solution which is 103M each in Mn2+,Fe2+,Zn2+  and  Hg2+  is treated with 106M  sulphide ion. If Ksp of  MnS,FeS,ZnS  and  HgS are 1015,1018,1024  and  1053 respectively , which one will precipitate first

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a

FeS

b

MnS

c

HgS

d

ZnS

answer is C.

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Detailed Solution

Precipitation occurs only when KIP>KSP  . Since the solubility product is the least among the given options. So it will get saturated first and will start to precipitate.  

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