Question

Assertion: Colloidal solutions show colligative properties.

Reason : Colloidal particles are large in size

• A. Assertion is correct but reason is incorrect.
• B. Both assertion and reason are incorrect.
• C. Assertion and reason both are correct but reason does not explain assertion
• D. Assertion is incorrect but reason is correct.
• E. Assertion and reason both are correct and the reason is the correct explanation of assertion

Answer 1

The correct option is C

Assertion and reason both are correct but reason does not explain assertion

Colloidal particles are bigger aggregates, the number of particles in a colloidal solution is comparatively small as compared to a true solution.

Thus, the values of all the colligative properties (relative lowering in vapour pressure, depression in freezing point, elevation in boiling point and osmotic pressure) are of small order as compared to values shown by a true solution with the same concentration.

Hence, assertion and reason both are correct but reason does not explain assertion.