WAEC Chemistry 2025 Objective — Question 10

Question 10 of 50 from the West African Examinations Council (WAEC) Chemistry 2025 Objective paper, with the correct answer and a full explanation.

Iodine could be separated from a mixture of iodine and calcium chloride by

A. evaporation
B. sublimationCorrect
C. fractional distillation
D. fractional crystallization

Explanation

Sublimation is the process where a solid changes directly to a gas without becoming liquid. Iodine can sublime, but calcium chloride cannot. So on heating the mixture, iodine sublimes and can be collected, leaving CaCl2 behind.

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