Ncert Exercises & Solutions

Which of the following binary mixtures will have the same composition in the liquid and vapour phase?

a. Benzene-toluene

b. Water-nitric acid

c. Water-ethanol

d. n-Hexane-n-heptane

The correct choice among the given is -

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, d)

Hint: Water-nitric acid and Water-ethanol are azeotropes

Mixtures having the same composition in the liquid and vapour phase are known as azeotropes. Azeotropes boil at the same temperature.

Here, water-nitric acid and water-ethanol mixtures are the non-ideal solutions. Hence, water-nitric acid and water-ethanol are

examples of azeotropes.

While benzene-toluene and n-hexane and n-heptane are examples of an ideal solution.