Question

The correct statements with respect to dialysis of colloidal solution are
I. Colloidal particles can pass through the membrane II. Animal bladder can be used as membrane III. Cellophane is not used as membrane IV. Ions or small molecules can diffuse through membrane into water

• A. I, II only
• B. II, III only
• C. III, IV only
• D. II, IV only

Hint:

In dialysis, colloidal particles cannot pass through a semipermeable membrane, whereas dissolved ions and small molecules can. Common dialysis membranes include animal bladder, parchment paper and cellophane.

Answer 1

The Correct Option is D

Step 1: Recall the principle of dialysis.
Dialysis purifies a colloid by placing it in a semipermeable membrane bag in water. Colloidal particles are too large to pass through the membrane; only small ions and molecules pass through.

Step 2: Evaluate each statement.
I: Colloidal particles cannot pass through the membrane -- False. II: Animal bladder can be used as membrane -- True (semipermeable). III: Cellophane is not used -- False (cellophane is commonly used). IV: Ions or small molecules can diffuse through the membrane into water -- True. Correct statements: II and IV. \[ oxed{II ext{ and } IV} \]