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A solution containing Na^(o+),NO(3)^(c-)...

A solution containing `Na^(o+),NO_(3)^(c-), Cl^(c-)`, and `SO_(4)^(2-)` ions, all at unit concentrations, is electrolyzed between nickel anode and platinum cathode. As the current is passed through the cell

A

`Ph` of the cathode increases

B

Oxygen is the major product at anode

C

Nickel is deposited at cathode.

D

Chlorine is the major product at anode.

Text Solution

Verified by Experts

The correct Answer is:
a,d
`a.` At cathod `:` Reduction of `Na^(o+)` does not occur but reduction of `H_(2)O` occurs to give `overset(c-)(O)H` and `H_(2)(g)` , so `pOH` decreases and `pH` increases.
At anode `:` Oxidation of `Cl^(c-)` ions occur to give `Cl_(2)(g)`. Likewise, oxidation of `NO^(c-)._(3)` and `SO_(4)^(2-)` does not occur but oxidation of `H_(2)O` occuts to give `H^(o+)` ions and `H_(2)(g)`. So `pH` decreases at anode.
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