First slide

Electrolysis

Question

Which of the following reaction is preferred at anode during the electrolysis of H₂SO₄ at higher concentration?

Easy

A

$2 H_{2} O (l) ⟶ O_{2} (g) + 4 H^{+} (aq) + 4 e^{-}$
B

$2 {SO}_{4}^{2 -} (aq) ⟶ S_{2} O_{8}^{2 -} (aq) + 2 e^{-}$
C

Both (a) and (b)
D

None of these

Solution

During the electrolysis of H₂SO₄ (dilute)
${2H}_{2} O (l) ⟶ O_{2} (g) + 4 H^{+} (aq) + 4 e^{-}; E_{cell}^{O} = 1 .23 V$
During the electrolysis of conc. H₂SO₄
$2 {SO}_{4}^{2 -} (aq) ⟶ S_{2} O_{8}^{2 -} (aq) + 2 e^{-}; E_{cell}^{\circ} = 1 .96 V$

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