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The following two reaction can occur dur...

The following two reaction can occur during electrolysis of aqueous sodium chloride solution
`Na^(+)(aq)+E^(-)rarrNa(s)E^(@)=-2.71 V`
`2H_(2)O(l)+2E^(-)rarrH_(2)(g)+2 OH^(@)(aq)E^(@)=-0.83 V`
Which reaction takes place preferentially and why ?

Text Solution

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As the standard reduction potential of `H_(2)O` is greater than that of `Na^(+)` ion, reduction of waer takes place preferentially, i.e., `H_(2)` is liberated at cathode.
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