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The ion precipitating first when a solution containing 0.01 M each of Pb2+,Zn2+,Mn2+ and Co2+ is saturated with H2S  is (which provides 1.0×1014M of S2n the solution) is 

  (Given: Ksp(PbS)=2.3×1027M2,Ksp(ZnS)=1.0×1021M2,Ksp(MnS)=7.9×1013M2)

 

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a
Pb2+
b
Zn2+
c
Mn2+
d
Co2+

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detailed solution

Correct option is A

Lesser the value of Ksp, earlier the salt precipitates. Hence, Pb2+ is precipitated first.

When cations and anions in an aqueous solution interact, a precipitate, an insoluble ionic solid, is created. The common ionic solids' solubility principles can be used to determine whether or not such a reaction takes place.

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