Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).
Assertion : Solubility of IIA group sulphates decreases down the group
Reason : Down the group in IIA group sulphates, lattice energy almost remains constant where as hydration enthalpy decreases
In the light of the given statements, choose the correct answer from the options given

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A is True but R is false

A is false but R is true

Both A and R are correct, but R is not correct explanation of A.

Both A and R are correct and R is correct explanation of A

answer is A.

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Detailed Solution

Going down the group, size of the cation increases.
Since, the lattice energy decreases much more than the hydration energy with increasing size solubility of hydroxide increases (when size of cation and anion are of comparable size).
if the anion is large compared to cation, the lattice energy will remain almost constant.
Since, hydration energy decreases down a group, solubility will decrease

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