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The INCORRECT statements below regarding colloidal solutions is: (1) A colloidal solution shows colligative properties. (2) An ordinary filter paper can stop the flow of colloidal particles. (3) The flocculating power of Al3+ is more than that of Na+. (4) A colloidal solution shows Brownian motion of colloidal particles.

1. (1)
2. (2)
3. (3)
4. (4)

Correct answer: (2)

Solution

Ordinary filter paper cannot stop colloidal particles (its pores are larger than colloidal size); only ultrafilters can. Statements about colligative properties, Hardy-Schulze flocculation (Al3+>Na+) and Brownian motion are all correct, so the incorrect one is (2).

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