Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. Assertion : Electrolysis of NaCl solution gives chlorine at anode instead of O 2 . Reason : Formation of oxygen at anode requires overvoltage.

Question

Philoid · Accepted Answer

In the electrolysis of NaCl solution, Chlorine is produced at anode instead of O_2. The two half-cell reactions are:

2Cl^-→ Cl_2(g) + 2e^- E^° = -1.36V

2H₂O →O_2(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.

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.Assertion : Electrolysis of NaCl solution gives chlorine at anode instead of O2.Reason : Formation of oxygen at anode requires overvoltage.