Solubility product constant (Ksp) of salts of types MX,MX2 and M3X at temperature 'T' are 4.0×10−8,3.2×10−14 and 2.7×10−15 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 DMX>M3X>MX2 MX:Ksp=S2=4×10−8 ⇒S=2×10−4
MX2:Ksp=4s3=3.2×10−14 ⇒S=2×10−5
M3X:Ksp=27s4=2.7×10−15 ⇒S=10−4 Hence, order of solubility is MX>M3X>MX2