1.

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

Answer»

`1:1:1`
`1:2:3`
`1:3:2`
`1:12`

ANSWER :4


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