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JEE Main levelSingle correct optionDifficulty 2 of 3pb135

Which of the following is an alum?

A $FeSO X_{4} \cdot (NH X_{4}) X_{2} SO X_{4} \cdot 6 H X_{2} O$
B $CuSO X_{4} \cdot 5 H X_{2} O$
C $ZnSO X_{4} \cdot 7 H X_{2} O$
D $K X_{2} SO X_{4} \cdot Cr X_{2} (SO X_{4}) X_{3} \cdot 24 H X_{2} O$

Answer: D

Alums have the type

M X^{I} X_{2} SO X_{4} \cdot M X^{I} II X_{2} (SO X_{4}) X_{3} \cdot 24 H X_{2} O

with a trivalent metal. Chrome alum fits. Mohr's salt is a double salt containing Fe(II), not an alum; the others are simple hydrates.

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