Assertion and Reason Questions on Class 12 Chemistry Chapter 5 Surface Chemistry

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

Q.1. Assertion: Detergents with low CMC are more economical to use.
Reason: Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.

Answer a

Q.2. Assertion: An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles.
Reason: Pore size of the filter paper becomes more than the size of colloidal particle.

Answer c

Q.3. Assertion : The value of colligative properties are of small order for colloids as compared to true solution.
Reason : Number of particles in colloidal solution is comparatively smaller than true solutions.

Answer (a) Colligative properties depend upon number of particles.

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