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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)

 

moderate
a

Pb2+

b

Zn2+

c

Mn2+

d

Co2+



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