Which of the following substances is not an i | vedclass

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(A) True alums have the general formula $M_{2}SO_{4} \cdot M'_{2}(SO_{4})_{3} \cdot 24H_{2}O$,where $M$ is a monovalent cation (like $K^{+}$,$NH_{4}^{

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$FeSO_{4} \cdot Al_{2}(SO_{4})_{3} \cdot 24H_{2}O$

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(A) True alums have the general formula $M_{2}SO_{4} \cdot M'_{2}(SO_{4})_{3} \cdot 24H_{2}O$,where $M$ is a monovalent cation (like $K^{+}$,$NH_{4}^{+}$) and $M'$ is a trivalent cation (like $Al^{3+}$,$Cr^{3+}$,$Fe^{3+}$).Pseudo alums have the general formula $MSO_{4} \cdot M'_{2}(SO_{4})_{3} \cdot 24H_{2}O$,where $M$ is a divalent cation (like $Fe^{2+}$,$Mg^{2+}$,$Mn^{2+}$).In option $A$,$FeSO_{4} \cdot Al_{2}(SO_{4})_{3} \cdot 24H_{2}O$ contains $Fe^{2+}$,which is a divalent cation,making it a pseudo alum.Options $B$,$C$,and $D$ are examples of true alums.

Which of the following substances is not an isomorphous true alum and is known as a pseudo alum?

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