Question

D. A mixture of acetone and benzene can be
seperated by the following method:
a. Simple distillation
b. Fractional distillation
c. Distillation under reduced pressure
d. Sublimation​

Answer 1

Answer:

Acetone cannot be easily separated from benzene in high purity by distillation because of the closeness of their vapor pressures. Acetone can be readily removed from benzene by azeotropic distillation using certain aromatic hydrocarbons

Explanation:

An azeotropic mixture is a mixture having a constant boiling point. The most familiar example is a mixture of ethanol and water in the ratio of 95.87: 4.13 (a ratio present in rectified spirit). It boils at 78.13oC. We can’t separate the constituents of an azeotropic mixture by fractional distillation. Hence, we have to use a special type of distillation (azeotropic distillation) for separating the constituents of an azeotropic mixture.

In this method, we use the third compound in distillation. The process uses the fact that dehydrating agents like diethyl ether etc. depress the partial pressure of one of the original components. As a result, the boiling point of that component raises sufficiently and thus, the other component will distil over.

Answer 2

Answer

Fractional Distillation

Explanation: