WAEC Chemistry 2025 Objective — Question 11

Question 11 of 50 from the West African Examinations Council (WAEC) Chemistry 2025 Objective paper, with the correct answer and a full explanation.

Sodium chloride is used in the following processes except

A. treatment of waterCorrect
B. manufacturing of chlorine
C. preservation of food
D. separation of soap from glycerol

Explanation

Sodium chloride (NaCl) is not a key agent used for water treatment. Water treatment typically uses chemicals like chlorine gas and alum for disinfection and coagulation, whereas NaCl is used in manufacturing chlorine gas (via electrolysis), food preservation, and salting-out during soap production.

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