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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sb108

Which statements about lithium sulphate and sodium sulphate are correct?

A $Li X_{2} SO X_{4}$ does not form alums
BLithium sulphate is insoluble in water
CSodium sulphate crystallises from water as the decahydrate $Na X_{2} SO X_{4} \cdot 10 H X_{2} O$
DLithium sulphate crystallises from water as the monohydrate $Li X_{2} SO X_{4} \cdot H X_{2} O$

Answer: A, C, D

Li2SO4 is anomalous in not forming alums and crystallises as

Li X_{2} SO X_{4} \cdot H X_{2} O

, whereas Na2SO4 crystallises as Glauber's salt

Na X_{2} SO X_{4} \cdot 10 H X_{2} O

. Lithium sulphate is quite soluble in water (about 35 g per 100 g water), unlike the sparingly soluble Li2CO3 and LiF.

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