1.

A dilute aqueous solution of Na_(2)SO_(4) is electrolysed using platinum electrodes. The products at the anode and cathode are

Answer»

`O_(2),H_(2)`
`SO_(2),NA`
`O_(2),Na`
`S_(2)O_(8)^(2-),H_(2)`

Solution :`H_(2)O` is more readily reduced than `Na^(+)`. It is also readily oxidized than `SO_(4)^(2-)`. Hence, the ELECTRODE reactions are:
At CATHODE:`2H_(2)O+2e^(-)toH_(2)+2OH^(-)`
At anode: `2H_(2)toO_(2)+4H^(+)+4e^(-)`


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