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

To separate a mixture of sand, ammonium chloride, and sodium chloride, we need to use methods that take advantage of their distinct physical properties: ammonium chloride can sublime, sodium chloride is soluble in water, and sand is neither soluble in water nor sublimes.

The correct order of separation steps should be:

1. Sublimation: Heat the mixture to sublime the ammonium chloride. Ammonium chloride will transition from solid to gas without passing through the liquid phase, leaving behind sand and sodium chloride.
2. Dissolution: Dissolve the remaining mixture of sand and sodium chloride in water. Sodium chloride is soluble in water, while sand is not.
3. Filtration: Filter the mixture to separate the insoluble sand from the sodium chloride solution.
4. Evaporation: Evaporate the water from the sodium chloride solution to obtain solid sodium chloride.

Given these steps, the correct order is:

C. sublimation → dissolution → filtration → evaporation