The general formula of alum is:

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Question

(A) Alums are double salts with the general formula $M_2SO_4 \cdot M'_2(SO_4)_3 \cdot 24H_2O$,where $M$ is a monovalent cation (such as $K^+$,$Na^+$,o

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$M_2SO_4 \cdot M'_2(SO_4)_3 \cdot 24H_2O$

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(A) Alums are double salts with the general formula $M_2SO_4 \cdot M'_2(SO_4)_3 \cdot 24H_2O$,where $M$ is a monovalent cation (such as $K^+$,$Na^+$,or $NH_4^+$) and $M'$ is a trivalent cation (such as $Al^{3+}$,$Cr^{3+}$,or $Fe^{3+}$). Therefore,the correct general formula is $M_2SO_4 \cdot M'_2(SO_4)_3 \cdot 24H_2O$.

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