(A) Alums are double salts with the general formula $M^I M^{III} (SO_4)_2 \cdot 12H_2O$,where $M^I$ is a monovalent metal ion (like $K^+$,$Na^+$,$NH_4

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One monovalent and one trivalent metal

(A) Alums are double salts with the general formula $M^I M^{III} (SO_4)_2 \cdot 12H_2O$,where $M^I$ is a monovalent metal ion (like $K^+$,$Na^+$,$NH_4^+$) and $M^{III}$ is a trivalent metal ion (like $Al^{3+}$,$Cr^{3+}$,$Fe^{3+}$). Therefore,all alums contain one monovalent and one trivalent metal.