Electrolysis

In electrolysis of brine solution,

H%20_%7B2%7D

gas is liberated at cathode. The solution contains four ions

Na%20%5E%7B%2B%7D%2C%20Cl%20%5E%7B%3F%7D%2C%20H%20%5E%7B%2B%7D

and

%5Coverset%7B%3F%7D%7BO%7D%20H

ions. There occurs a race amongst them for their discharge at their respective electrodes.

Following electrode reactions are possible:

Cathode

2%20H%20_%7B2%7D%20O%20(l)%2B2%20e%5E%7B-%7D%20%5Clongrightarrow%20H%20_%7B2%7D(g)%2B2%20%5Coverset%7B-%7D%7B%7BO%7D%7D%20H%20(aq)

Anode

2%20Cr%20(%20aq%20)%20%5Clongrightarrow%20Cl%20_%7B2%7D(%20g%20)%2B2%20e%5E%7B-%7D

In this electrolysis,

H%20_%7B2%7D

at cathode and

Cl%20_%7B2%7D

at anode are given off.

Chapter Questions
1 MCQs