JAMB Chemistry 2021 Objective — Question 5

Question 5 of 41 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2021 Objective paper, with the correct answer and a full explanation.

The sequence of separation techniques required to separate a mixture of sand, sodium chloride and iodine is

A. Filtration → sublimation → dissolution → evaporation
B. Dissolution → sublimation → filtration → evaporation
C. Dissolution → filtration → sublimation → evaporation
D. Sublimation → dissolution → filtration → evaporationCorrect

Explanation

First: sublimation (heat to remove iodine as vapour). Then: dissolve residue in water (dissolution). Then: filter to remove sand. Then: evaporate filtrate to recover NaCl.

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