Question

Assertion: When a solution is separated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from the pure solvent side to the solution side.

Reason: Diffusion of the solvent occurs from a region of high concentration solution to a region of low concentration solution.

• A. Assertion and reason both are correct statements and reason is the correct explanation for assertion.
• B. Assertion and reason both are correct statements but the reason is not the correct explanation for assertion.
• C. Assertion is a correct statement but the reason is a wrong statement.
• D. Assertion and reason both are incorrect statements.
• E. Assertion is a wrong statement but the reason is a correct statement.

Answer 1

The correct option is C

Assertion is a correct statement but the reason is a wrong statement.

Analysing the assertion :

The flow of the solvent molecules from the solvent side where the concentration is low to the solution side where the concentration is high through a semi-permeable membrane is called osmosis.

So, the assertion is a correct statement.

Analysing the reason :

A semi-permeable membrane permits the solvent molecules to flow from a region of lower concentration to the region of higher concentration.

Thus, the solvent molecules always flow from a region of lower concentration to a region of higher concentration.

So, the reason is an incorrect statement.

Hence, the assertion is a correct statement, but the reason is a wrong statement.

So, option (C) is the correct answer.