Question

Which of the following methods is used to obtain 95.5% pure alcohol?

• A. Gravitation
• B. Separating funnel
• C. Decantation
• D. Fractional distillation

Answer 1

The correct option is D

Fractional distillation

Fractional distillation is used to obtain 95.5% pure alcohol. This can be obtained from a mixture of alcohol and water due to the difference in boiling points of these liquids. The boiling point of alcohol is $78.5{}^{\circ }C$ and water is $100{}^{\circ }C$. In this method, the liquids with lower boiling point change into vapours. These vapours are collected and condensed in a condenser.