Question

The principle behind the separation of two substances through distillation is difference in _____ between gangue and ore particles.

• A. weight
• B. boiling point
• C. size
• D. melting point

Answer 1

The correct option is B boiling point

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Distillation is a refining process that is used to purify low boiling metals like mercury and zinc. The impurities(gangue) usually have high boiling point than metals and hence are left behind whereas the metal vapourises and can be collected.
So, the principle behind refining through distillation is the difference in the boiling point between gangue and ore particles.