Which of the following statements about the given experimental set-up is/are incorrect ?

I. It is used to separate a mixture of two or more miscible liquids for which the difference in boiling points is more than `25` K.
II. It is used for the separation of different gases from air.
III. It is used to separate acetone and water from their mixture.
IV. It is based on the principle of repeated cooling and condensation of vapours by providing surface for the vapours.

Options

A. I only
B. III and IV only
C. I and II only
D. I and III only

Answer

D

Explanation

The given experimental set-up shows fractional distillation method. This method is used to separate a mixture of two or more miscible liquids for which the difference in boiling points is less than 25 K. Acetone (b.p. 329 K) and water (b.p. 373 K) are separated from their mixture by simple distillation method, as the difference in boiling points is more than 25 K.