Question

Assertion: Electrolysis of NaCl solution gives chlorine at anode instead of $O_2$.Reason: Formation of oxygen at anode requires overvoltage.

• A. Assertion is false but the reason is true.
• B. Both assertion & reason are fals
• C. Both assertion and reason are true but reason is not the correct explanation of assertion
• D. Assertion is true but the reason is false
• E. Both assertion and reason are true and reason is the correct explanation of assertion.

Answer 1

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

Assertion:
In the electrolysis of $NaCl$ solution, chlorine is
produced at anode instead of $0_{₂}$. The two

half-cell reactions are:

$2C{1}^{-}\to C{l}_{₂}\left(g\right)+2e^{-};E^{\circ }=1.36V$

$2H_{₂}O\to O_{₂}\left(g\right)+4H^{+}+4e¯;E^{\circ }=1.23V$

Reason:

The lower value of $E_{cell}$this preferred, but due
to overvo tage chlorine is liberated at anode.

Thus, the reason is true!

Hence, both the assertion and the reason are
true, and the reason is the correct explanation
for the assertion.

So, option (A) is the correct answer