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A dilute aqueous solution of Na(2)SO(4) ...

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

A

`O_(2),H_(2)`

B

`SO_(2),Na`

C

`O_(2),Na`

D

`S_(2)O_(8)^(2-),H_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`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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Knowledge Check

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

    A
    `O_(2),H_(2)`
    B
    `S_(2)O_(8)^(2-),Na`
    C
    `O_(2),Na`
    D
    `S_(2)O_(8)^(2-),H_(2)`

  • A dilute aqueous solution of Na_2SO_4 is electrolysed using platinum electrodes. The products at the anode and cathode are respectively

    A
    `O_2,H_2`
    B
    `S_2O_8^(2-).Na`
    C
    `O_2,Na`
    D
    `S_2O_8^(2-),H_2`

  • A dilute aqueous solution of CuSo_4 is electrolysed using platinum electrods. The products at the anode and cathode are:

    A
    `O_2,H_2`
    B
    `H_2,O_2`
    C
    `O_2,Cu`
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