First slide

Electrolysis

Question

An aqueous solution of Na₂SO₄ in water is electrolysed using Pt electrodes. The products at the cathode and anode are respectively :

Easy

A

H₂, SO₂
B

O₂, NaOH
C

H₂, O₂
D

O₂, SO₂

Solution

$E_{{Na}^{+} ∣ Na}^{\circ} < E_{H^{+} ∣ H_{2}}^{\circ}; E_{{SO}_{4}^{2 -} ∣ S_{2} O_{8}^{2 -}}^{\circ} < E_{H_{2} O ∣ O_{2}}^{\circ}$

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