Assertion : $M g S O_{4}$ is water soluble but $B a S O_{4}$ is not. Reason: The lattice energy of $B a S O_{4}$ predominates over its hydration energy while in $M g S O_{4}$ , $M g^{2 +}$ being smaller in size and thus hydration energy predominates over lattice energy of $M g S O_{4}$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
For solubility condition lattice energy must be less than the hydration energy,
$M g S O_{4}$ is water-soluble but $B a S O_{4}$ is not.

Lattice energy of $B a S O_{4}$ predominates over its hydration energy while in $M g S O_{4}$ , $M g^{2 +}$ being smaller in size and thus hydration energy predominates over lattice energy of $M g S O_{4}$ .

So Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Hence option A is correct.

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Assertion

Lithium sulphate does not form alums.

Reason

$L i^{+}$ is too small to form a stable lattice required for double-salt/alum formation.

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