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Question

When an aqueous solution of sodium chloride is electrolysed using platinum electrodes, the ions discharged at the electrodes are:

A
sodium and hydrogen
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B
sodium and chloride
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C
hydrogen and chloride
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D
hydroxyl and chloride
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Solution

The correct option is B hydrogen and chloride
Electrolysis of aqueous NaCl:-

NaClNa+(aq)+Cl(aq)
H2O(l)H+(aq)+OH(aq)

At Cathode:-
Hydrogen reduction takes place in preference to Na+ as a reduction potential of Na+ is less than Hydrogen.
2H++2eH2(g)---------reduction.

At Anode:-
Chlorine gas gets oxidized at the anode in preference to OH

2ClCl2(g)+2e.

hydrogen and chloride discharged at the cathode and anode, respectively.
Option C is correct.

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