9701 MCQ Solution 18

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Question 18: [Physical > Electrochemistry]:
In the industrial electrolysis of brine to manufacture chlorine, the diaphragm used is a porous screen which allows the flow of electrolytes but keeps other chemicals separate.

Which substance needs to be kept separate from the chlorine by the diaphragm?

A hydrogen
B sodium hydroxide
C sodium chloride
D water
Reference: Past Exam Paper – November 2002 Paper 1 Q13



Solution 18:
Answer: B.

Sodium hydroxide needs to be separated since it is the only choice that can react with the chlorine formed.

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