Question

Crystallisation is better than simple evaporation because:

• A. soilds can decompose
• B. may get charred when heated to dryness
• C. the contaminate can still be present
• D. all of these

Answer 1

The correct option is D

all of these

Crystallisation is better than simple evaporation because:
1. The process of evaporation gives a residue which may contain some impurities. When we need to obtain the solid without impurities, crystallisation is preferred.
2. In evaporation, heat has an adverse effect on the mixture that is to be separated. For example, soilds can decompose and may get charred when heated to dryness.