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An aqueous solution contains Ni^(2+), Co...

An aqueous solution contains `Ni^(2+), Co^(2+), Pb^(2+)` ions at equal concentrations. The solubility product of NiS, PbS and CoS in water at `25^@C` are respectively given below. Indicate which of these ions will be precipitated first and last when sulphide concentration is progressively increased from zero ?`[K_(sp) of NiS=3xx10^(-19), K_(sp) of CoS=4xx10^(-21), K_(sp) of PbS=3xx10^(-28)`

A

NiS and PbS

B

NiS and CoS

C

CoS and NiS

D

PbS and NiS

Text Solution

Verified by Experts

The correct Answer is:
D
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