A mixture contains ammonium chloride, sand, and sodium chloride. Which process sequence correctly separates these components?

C) sublimation → dissolution → filtration → evaporation

Here's why this order works:

1. Sublimation: Ammonium chloride is the only substance in the mixture that sublimes (changes directly from solid to gas upon heating and back to solid upon cooling). Heating the mixture will separate the ammonium chloride from the sand and sodium chloride.
2. Dissolution: After sublimation, you are left with sand and sodium chloride. Add water to this mixture. Sodium chloride will dissolve in the water, forming a solution, while sand will not dissolve.
3. Filtration: The insoluble sand can then be separated from the sodium chloride solution by filtration. The sand will remain on the filter paper, and the sodium chloride solution will pass through.
4. Evaporation: Finally, the water can be evaporated from the sodium chloride solution, leaving behind the solid sodium chloride.

The correct option is C.