Question

Which of the following can pass through semi-permeable membrane?

• A. Solvent molecules
• B. Solute molecules
• C. Complex ion
• D. Simple ion

Hint:

Osmosis is solvent flow through a semi-permeable membrane from dilute to concentrated solution.

Answer 1

The Correct Option is A

Step 1: Concept of osmosis.
Semi-permeable membranes allow only solvent molecules (commonly water) to pass through, but not solute particles.
Step 2: Analyze options.
(A) Solvent molecules: Correct — these can move across the membrane.
(B) Solute molecules: Blocked.
(C) Complex ions: Too large to pass.
(D) Simple ions: Generally do not cross without special ion channels.
Step 3: Conclusion.
Thus, solvent molecules can pass through semi-permeable membranes.