Q. 61

Assertion : Electrolysis of NaCl solution gives chlorine at anode instead of O2.

Reason : Formation of oxygen at anode requires overvoltage.

Answer :

(i) Both assertion and reason are true and the reason is the correct explanation of assertion.

In the electrolysis of NaCl solution, Chlorine is produced at anode instead of O2. The two half-cell reactions are:


2Cl- Cl2(g) + 2e- E° = -1.36V


2H2O O2(g) + 4H+ + 4e- E° = -1.23V


Generally, the one with the lower value is preferred but in this case Chlorine is produced at anode. This is because formation of oxygen at anode requires overvoltage.


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