First slide

Electrolysis

Question

Which of the following ions is obtained at the cathode when an aqueous solution of sodium hydroxide is electrolysed ?

Easy

A

Hydrogen
B

Hydroxyl group
C

Oxygen
D

Sodium

Solution

At Anode
$4O{H^ - } \to {O_2} + 2{H_2}O + 4{e^ - }$
At Cathode
$SRP\,\,of\,\,{H_2}O > SRP\,of\,N{a^ + }$
$2{H_2}O \rightleftharpoons {H_2} + 2O{H^ - } - 2{e^ - }$

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