1.

The sequence of ionic mobilty in the aqueous solution is

Answer»

`K^(+) gt NA^(+) gt Rb^(+) gt Cs^(+)`
`Cs^(+) gt Rb^(+) gt K^(+) gt Na^(+)`
`Rb^(+) gt K^(+)gt Cs^(+) gt Na^(+)`
`Na^(+) gt K^(+) gt Rb^(+ gt Cs^(+ )`

Solution :SMALLER the size of an ion, more strongly it is HYDRATED and less is the ionic mobility. The sizes of the unhydrated ions increase in the ORDER:
`Na^(+) lt K^(+) lt Rb^(+) lt Cs^(+)`
The sizes of the hydrated ions will be in the order:
`Cs^(+) lt Rb^(+) lt K^(+) lt Na^(+) `
Hence, their ionic mobilities will be in the order:
`Cs^(2+) gt Rb^(+) gt K^(+) gt Na^(+)`


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