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JEE Main levelSingle correct optionDifficulty 2 of 3sb094

Which of the following sulphates does not form an alum of the type $M X_{2} SO X_{4} \cdot Al X_{2} (SO X_{4}) X_{3} \cdot 24 H X_{2} O$ ?

A $K X_{2} SO X_{4}$
B $Li X_{2} SO X_{4}$
C $Na X_{2} SO X_{4}$
D $Rb X_{2} SO X_{4}$

Answer: B

Alums are formed by the larger monovalent cations (Na, K, Rb, Cs and ammonium). Li+ is too small, and

Li X_{2} SO X_{4}

does not form alums, which is an anomaly of lithium.

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