Question

An azeotropic solution of two liquids has boiling point lower than either of them when it

A. shows negative deviation from Raoult’s law

B. shows no deviation from Raoult’s law

C. shows positive deviation from Raoult’s law

D. is saturated

Answer : shows positive deviation from Raoult’s law

Solution :
Lower the $$B.$$ $$pt.,$$ higher will be the $$V.P.$$ The $$V.P.$$ of the mixture is greater than either of the two liquids.
[NOTE : In case of positive deviation from Roult's law the partial vapour pressure of each liquid and total vapour pressure of solution will be greater as compared to initial solution]

Releted MCQ Question on
Physical Chemistry >> Solutions

Releted Question 1

An azeotropic solution of two liquids has boiling point lower than either of them when it

A. shows negative deviation from Raoult’s law

B. shows no deviation from Raoult’s law

C. shows positive deviation from Raoult’s law

D. is saturated

Releted Question 2

For a dilute solution, Raoult’s law states that :

A. the lowering of vapour pressure is equal to the mole fraction of solute.

B. the relative lowering of vapour pressure is equal to the mole fraction of solute.

C. the relative lowering of vapour pressure is proportional to the amount of solute in solution.

D. the vapour pressure of the solution is equal to the mole fraction of solvent.

Releted Question 3

When mercuric iodide is added to the aqueous solution of potassium iodide then

A. freezing point is raised.

B. freezing point is lowered.

C. freezing point does not change.

D. boiling point does not change.

Releted Question 4

Which of the following $$0.1 M$$ aqueous solutions will have the lowest freezing point?

A. Potassium sulphate

B. Sodium chloride

C. Urea

D. Glucose

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