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Q.

The solubility product of PbBr2 is 10.8x10-5. It is 70% dissociated in saturated solution. The solubility of salt is

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a

4.285×10−2

b

6.756×10−3

c

3.399×10−4

d

5.435×10−2

answer is A.

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Detailed Solution

PbBr2⇄Pb2+0.7S+2Br-2×0.7S Ksp=Pb2+Br−2=(0.7S)(2×0.7S)2 10.8×10−5=(0.7)3×4S3 ∴ S=4.285×10−2M
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