1.

Least mobile ion is :-

Answer»

`[Be(H_(2)O)_(N)]^(+2)`
`[Na(H_(2)O)_(n)]^(+)`
`[MG(H_(2)O)_(n)]^(+2)`
`[Li(H_(2)O)_(n)]^(+)`

Solution :`["mobility" prop (1)/("size of hydrated ion")]`


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