Exams › JEE Main › Chemistry

Among the following, the INCORRECT statement about colloids is: (1) The range of diameters of colloidal particles is between 1 and 1000 nm (2) They are larger than small molecules and have high molar mass (3) They can scatter light (4) The osmotic pressure of a colloidal solution is of higher order than the true solution at the same concentration.

1. The range of diameters of colloidal particles is between 1 and 1000 nm
2. They are larger than small molecules and have high molar mass
3. They can scatter light
4. The osmotic pressure of a colloidal solution is of higher order than the true solution at the same concentration.

Correct answer: The osmotic pressure of a colloidal solution is of higher order than the true solution at the same concentration.

Solution

The statement about the osmotic pressure of a colloidal solution being higher than that of a true solution at the same concentration is incorrect because colloidal particles do not contribute to osmotic pressure in the same way that solute molecules do, leading to lower osmotic pressure compared to true solutions.

Related JEE Main Chemistry questions

• At constant temperature, the Freundlich adsorption relation for a gas adsorbed on a solid can be written in terms of the amount adsorbed per unit mass of adsorbent as:
• Which of the following is an example of an irreversible colloid when water acts as the dispersion medium?
• Which of the following forms cationic micelles when its concentration exceeds a certain limit?
• In a micelle, how are the polar and non-polar regions arranged?
• A colloidal dispersion is placed in an electric field, and its particles migrate toward the anode. If the same sol is coagulated using NaCl, BaCl2, and AlCl3 solutions, what is the correct order of their coagulating ability?
• Which of the following electrolytes is the most effective for coagulating ferric hydroxide sol?

⚔️ Practice JEE Main Chemistry free + battle 1v1 →