Chemistry 2006 JAMB Past Questions - Question 37: The order in which a mixture of sand, ammonium chloride and sodium chloride can be separated is

Correct Answer

B

Explanation

The correct order in which a mixture of sand, ammonium chloride, and sodium chloride can be separated is:

1. Filtration - Sand can be separated from the mixture using filtration, as it is insoluble in water.

2. Sublimation - Ammonium chloride can be separated from the mixture through sublimation, as ammonium chloride undergoes sublimation (changing directly from solid to vapor) at certain conditions.

3. Dissolution - Sodium chloride can be separated from the remaining mixture by dissolving it in water. Sodium chloride is soluble in water.

4. Evaporation - The solution obtained after dissolving sodium chloride can be heated to evaporate the water, leaving behind the separated sodium chloride.

So, the correct order is: Filtration -> Sublimation -> Dissolution -> Evaporation.