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32
MCQ (Multiple Correct Answer)

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

A
Benzene-toluene
B
Water-nitric acid
C
Water-ethanol
D
$n$-hexane- $n$-heptane
33
MCQ (Multiple Correct Answer)

In isotonic solutions ........... .

A
solute and solvent both are same
B
osmotic pressure is same
C
solute and solvent may or may not be same
D
solute is always same solvent may be different
34
MCQ (Multiple Correct Answer)

For a binary ideal liquid solution, the variation in total vapour pressure versus composition of solution is given by which of the curves?

A
B
C
D
35
MCQ (Multiple Correct Answer)

Colligative properties are observed when .............. .

A
a non-volatile solid is dissolved in a volatile liquid
B
a non-volatile liquid is dissolved in another volatile liquid
C
a gas is dissolved in non-volatile liquid
D
a volatile liquid is dissolved in another volatile liquid
36
Subjective

Components of a binary mixture of two liquids $A$ and $B$ were being separated by distillation. After some time separation of components stopped and composition of vapour phase became same as that of liquid phase. Both the components started coming in the distillate. Explain why this happened?

Explanation

Both the components are appearing in the distillate and composition of liquid and vapour is same. This shows that liquids have formed azeotropic mixture and boils at constant temperature hence cannot be separated at this stage by distillation or fractional distillation. Solution having azeotropic nature show large positive or negative deviation from Raoult's law depending upon intermolecular interaction.