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. Solubilities (mol dm−3) fo 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 Order of solubility is MX>M3X>MX2