If the salts M2X,QY2 and PZ3 have same solubilities (<<<1) ,their Ksp values are related as:
A
M2X=QY2=PZ3
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B
M2X=QY2<PZ3
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C
M2X=QY2>PZ3
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D
M2X<QY2=PZ3
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Solution
The correct option is CM2X=QY2>PZ3 Let S be the solubility in moles/ litre. The expression for the solubility product of M2X is (2S)2S=4S3 The expression for the solubility product of QY2 is S(2S)2=4S3 The expression for the solubility product of PZ3 is S(3S)3=27S4 Since S<<<1, M2X=QY2>PZ3.