Which of the following statement about the sulphate of alkali metal...

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Which of the following statement about the sulphate of alkali metal is correct?
(a) Except \( \mathrm{Li}_{2} \mathrm{SO}_{4} \) all sulphate of other alkali metals are soluble in water
(b) All sulphate salts of alkali metals except lithium sulphate forms alum.
(c) All sulphate salts of alkali metals except lithium sulphate do not decompose at high temperature
\( \mathrm{P} \)
(d) All of the above
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