Question

Among the following the azeotropic mixture is:

• A. $C{H}_{3}OH+CHC{l}_3$
• B. $C_6{H}_{14}+C_7{H}_{16}$
• C. $C_2{H}_{5}Br+C_2{H}_{5}Cl$
• D. None of these

Answer 1

The correct option is A $C{H}_{3}OH+CHC{l}_3$

Liquid mixture of two miscible liquids which distill over without changes in composition is called Azeotropic mixture.
Ideal solution does not form azeotropic mixture.
For ideal solution, solvent-solute interaction is equal to solvent-solvent and solute-solute interactions.
These solutions obeys Raoult’s law over the entire range of concentration.
(b) $\Rightarrow$ n-heptane and n-hexane solution
(c) $\Rightarrow$ Bromoethane and Chloroethane solutions are examples of ideal solution.
Thus, they obeys Raoult's law over entire range of composition so it won't form azeotropic mixtures.

$C{H}_{3}OH+CHC{l}_3$ is a non-ideal solution showing large positive deviation from Raoult’s law. It boils at a temperature lower than the boiling points of it components. Thus, it forms a minimum boiling azetrope.