Which of the following statement about the sulphate of alkali metal is correct? '

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All sulphates of alkali metals except lithium sulphate forms alum

Except Li₂SO₄ all sulphate of other alkali metals are soluble in water

The sulphates of alkali metals cannot be hydrolysed

All of the above

answer is D.

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Detailed Solution

Li does not form alum because of small size of ${Li}^{+}$ .

Li behaves differently from the other group members because of the relatively narrow radius. Except for lithium sulphate, all sulphate salts of alkali metals combine to create alum. With the exception of lithium sulphate, none of the sulphate salts of alkali metals breakdown at high temperatures. Water has the lowest solubility for Li₂ SO₄.
Therefore, each of the claims is true.

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