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Which of the following wil give H(2((g)...

Which of the following wil give ` H_(2_((g)))` at cathode and ` O_(2_((g)))` at anode on electrolysis using platinum electrodes

Text Solution

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The correct Answer is:
C
For dilute aq. Solution of NaCl.
`NaCl=Na^(+)+Cl^(-)`
`H_(2)O=H^(+)+OH`
At cathode
`H^(+)` will discharge since the discharge potential of
`H^(+) lt Na^(+)`
`2H^(+)+2e^(-)toH_(2)(g)`
At anode Due to very lesser amount of `Cl^(-),OH^(-)` ions will discharge at anode
`4OH^(-)toO_(2)+2H_(2)O+4e^(-)`
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