Question

26. In vacuum distillation, substance boils at a/an
a) Exact temperature
b) temperature slightly above its boiling point
c) temperature below its boiling point
d) high pressures​

Answer 1

Vacuum distillation is a method of distillation where by the pressure above the liquid mixture to be distilled is reduced to less than its vapour pressure, usually less than atmospheric pressure, causing evaporation of the most volatile liquids those with the lowest boiling points. This distillation method works on the principle that boiling occurs when the vapor pressure of a liquid exceeds the ambient pressure.

Answer 2

Answer: Vacuum distillation is a technique for the purification or separation of liquids or solvents with a boiling point above 150 ºC, or with a lower boiling point but which are thermally unstable. Vacuum pumps can be used as a vacuum source.

Explanation: