1.

Alum is found to contain hydrated monovalent cation [M(H_(2)O)_(6)]^(+) trivalent cation [M'(H_(2)O)_(6)]^(+) and SO_(4)^(3-) in the ratio of:

Answer»

`1:1:1`
`1:2:3`
`1:3:2`
`1:1:2`

SOLUTION :Formula of alums contain the ions `[M(H_(2)O)_(6)]^(+),[M'(H_(2)O)_(6)]^(3+)` and `SO_(4)^(2-)` in the ratio `1:1:2` Example : (i)Potash alum `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O` , (ii)Chrome alum `K_(2)SO_(4).Cr_(2)(SO_(4))_(3).24H_(2)O`


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