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At cathode, the electrolysis of aqueous ...

At cathode, the electrolysis of aqueous `Na_(3)SO_(4)` gives

A

`Na`

B

`H_(2)`

C

`SO_(3)`

D

`SO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
Calomel electrode used as a reference electrdrode uses `Hg_(2)Cl_(2)`.
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Predicating the products of electrolysis: What do you expect to be the half reactions in the electrolysis of aqueous Na_(2)So_(4) solution. Strategy: Before we look at the electrode reations, we should consider the following facts: (1) Since Na_(2)So_(2) does not hydrolyze in water, the pH of the solution is close to 7. (2) The Na^(+) ions are not reduced at the cathode and the SO_(4)^(2-) ions are not oxidized at the anode. These conclusions are drawn from the electrolysis of water in the presence of sulphuric acid in aqueous sodium chloride solution.

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