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Give reason for decreasing order of cond...

Give reason for decreasing order of conductivity of following
`Cs^(+) gt Rb^(+) gt K^(+) gt Na^(+) gt Li^(+)`

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Ions are hydrated in solution. Since `Li` is very small it is heavily hydrated. This make the radius of the hydrated ions large and hence it moves only slowly (although `Li^(+)` is very small) and the radius of hydrated `Cs^(+)` ion is smaller than the radius of hydrated `Li^(+)`.
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Electrolysis is an important technique for extraction of metals, and each ion of the solution needs a minimum voltage to get discharged and this value is expressed in terms of discharge potential. For some metal ions the discharge potentials follow the order given below : Li^(+) gt K^(+) gt Ca^(2+) gt Na^(+) gt Mg^(2+) gt Al^(3+) gt Zn^(2+) gt Fe^(2+) gt Ni^(2+) gt H_(3)O^(+) gt Cu^(2+) gt Hg_(2)^(2+) gt Ag^(+) gt Au^(3+) For some anions the discharge potentials are in the order : SO_(4)^(2-) gt NO_(3)^(-) gt OH^(-) gt Br^(-) gt I^(-) When aqueous solution of cupric bromide is electrolyzed the product obtained at cathode will be :

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