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Question

Solubility product constant (Ksp) of salts of types MX,MX2 and M3X at temperature 'T' are 4.0×108,3.2×1014 and 2.7×1015 respectively. The solubilities (mol/dm^3) of the salts at temperature 'T' are in the order:


A
MX>MX2>M3X
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B
M3X>MX2>MX
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C
MX2>M3X>MX
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D
MX>M3X>MX2
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Solution

The correct option is D MX>M3X>MX2
MX:Ksp=S2=4×108
S=2×104

MX2:Ksp=4s3=3.2×1014
S=2×105

M3X:Ksp=27s4=2.7×1015
S=104
Hence, order of solubility is MX>M3X>MX2

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