Which of the following is a true alum?

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Question

(B) An alum is a double salt with the general formula $M_2SO_4 \cdot M'_2(SO_4)_3 \cdot 24H_2O$,where $M$ is a monovalent cation (like $K^+$,$Na^+$,$N

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$K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$

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(B) An alum is a double salt with the general formula $M_2SO_4 \cdot M'_2(SO_4)_3 \cdot 24H_2O$,where $M$ is a monovalent cation (like $K^+$,$Na^+$,$NH_4^+$) and $M'$ is a trivalent cation (like $Al^{3+}$,$Cr^{3+}$,$Fe^{3+}$).$Li^+$ is too small to form a stable alum structure.Therefore,$K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$ (Potash Alum) is a true alum,while the lithium compound is not.

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