First slide

Electrolysis

Question

A dilute aqueous solution of Na₂SO₄ is electrolysed using platinum electrodes. The products at the anode and cathode are

Easy

A

O₂, H₂
B

SO₂, Na
C

O₂, Na
D

S₂O₈^-2 ;H₂

Solution

Pt electrodes are inert electrodes and does not under go any chemical change.
In aq. solution of Na₂SO₄ :
$N{a_2}S{O_4} \rightleftharpoons 2N{a^ + } + SO_4^{ - 2}$
At Cathode : Discharge potential of H₂O < Na⁺ or SRP of H₂O > Na⁺
H₂O undergoes reduction.
$2{H_2}O + 2{e^ - } \rightleftharpoons {H_2} + 2O{H^ - }$
At Anode : Discharge potential of $H_{2}O\;< SO_{4}^{-2}$ ,H₂O undergoes oxidation.
$2{H_2}O \rightleftharpoons 4{H^ + } + 4{e^ - } + {O_2}$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App