Question

On the basis of information given below mark the correct option information.
(I) In bromoethane and chloroethane mixture intermolecular interactions of A-A and B-B type are nearly same as A-B type interactions.
(II) In ethanol and acetone mixture A-A or B-B type intermolecular interactions are stronger than A-B type interactions.
(III) In chloroform and acetone mixture A-A or B-B type intermolecular interactions are weaker than A-B type interactions.

• A. Solution (II) and (III) will follow Raoult's law
• B. Solution (I) will follow Raoult's law
• C. Solution (II) will show negative deviation from Raoult's law
• D. Solution (III) will show positive deviation from Raoult's law

Answer 1

Answer: (B)

Solution (I) will follow Raoult's law

Raoult's law is an important law of thermodynamics. It states that the partial pressure of each component of an ideal mixture of the liquids will be equal to the vapour pressure of the pure component multiplied by its mole fraction in the mixture.

Here solution-1 will follow Raoult's law because the solution formed after the mixing will be ideal. And hence it will not show any deviation as the intermolecular forces after mixing will also be the same.

Thus correct option is B.