First slide

Electrolysis

Question

Statement 1: Electrolysis of NaCl solution gives chlorine at anode instead of O₂.
Statement 2: Formation of oxygen at anode requires over voltage.

Easy

A

Both statements 1 and 2 are correct
B

Both statements 1 and 2 are incorrect
C

Statement 1 is correct statement 2 is incorrect
D

Statement 1 is incorrect statement 2 is correct

Solution

Electrolysis of NaCl is represented by following chemical reactions
${At cathode H}^{+} (aq) + e^{-} ⟶ \frac{1}{2} H_{2} (g)$
$At anode {Cl}^{-} (aq) ⟶ \frac{1}{2} {Cl}_{2} + e^{-}; E_{cell}^{\circ} = 1 .36 V$
$2 H_{2} O (aq) ⟶ O_{2} (g) + 4 H^{+} (aq) + 4 e^{-}; E_{cell}^{\circ} = 1 .23 V$
$E_{cell}^{o}$ for this reaction has lower value but formation of oxygen at anode requires over potential.

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