1.

Alum is the name used for all double salts having the composition M_(2)^(-) SO_(4).M_(2)^(III)(SO_(4))_(3).24H_(2)O. Where M^(III) stands for AI^(+3), Cr^(+3), Fe^(+3), while M^(I) stands for

Answer»

`Li^(+), CU^(+), Ag^(+)`
`Li^(+), NH_(4)^(+), Na^(+)`
`Na^(+), K^(+), Rb^(+)`
`Ca^(+2), Mg^(+2), SR^(+2)`

Solution :`M^(-)`-Monovalent cation except `Li^(+)` DUE to small size.


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