Question

Intermolecular forces between n-hexane and n-heptane are nearly same as between hexane and heptane individually. When these two are mixed, which of the following is not true about the solution formed?

• A. It obeys Raoult's law, i.e, $p_A=x_A{p}_A^o$ and $p_B=x_B{p}_B^o$
• B. $\Delta H_{mixing}$ is zero
• C. $\Delta V_{mixing}$ is zero
• D. It forms minimum boiling azeotrope

Answer 1

The correct option is D It forms minimum boiling azeotrope

The above-mentioned solution is an ideal solution since the intermolecular attractive forces before mixing the components are equal to the intermolecular forces after forming the solution.
Azeotropes are formed by the solutions which show deviations from ideal behaviour.