Question

What is the voltage at which electrolysis of brine takes place?

(a) < 2.2 V

(b) > 2.2 V

(c) 2.2 V

(d) Brine cannot be electrolysed

I have been asked this question in a national level competition.

My query is from Oxidation Reduction in division General Principles and Processes of Isolation of Elements of Chemistry – Class 12

Answer 1

The correct answer is (b) > 2.2 V

To explain I would say: According to theoretical calculations, the minimum potential difference required for the electrolysis of brine is 2.2 V. But, due to overvoltage, actual electrolysis requires an emf greater than 2.2 V.