Question

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

Reason: Formation of oxygen at anode requires overvoltage.

पर्याय

• Both assertion and reason are true and the reason is the correct explanation of assertion.

• Both assertion and reason are true and the reason is not the correct explanation of assertion.

• Assertion is true but the reason is false.

• Both assertion and reason are false.

• Assertion is false but reason is true.

Answer 1

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

Explanation:

At the anode, the following oxidation reactions are possible.

\[\ce{Cl^{-} (aq) -> 1/2 Cl_{2}(g) + e^{-}; E = 1.36V}\]

\[\ce{2H2O(l) -> O2(g) + 4H^{-} (aq) + 4e^{-}; E = 1.23V}\]

Lower value of E_cell is perferenced but due to overvolatage chlorine is liberated at anode.