Exams › JEE Main › Chemistry

Which statement is incorrect about the adsorption of a gas on the surface of a solid?

1. Adsorption keeps increasing continuously as temperature rises
2. The enthalpy change and entropy change are both negative
3. Certain substances show greater adsorption than others
4. This process is reversible

Correct answer: Adsorption keeps increasing continuously as temperature rises

Solution

Physical/chemical adsorption is exothermic, so adsorption decreases (does not increase) with rising temperature; that statement is incorrect. The other statements are true: dH and dS are both negative, adsorption is specific (some substances adsorb more), and the process is reversible.

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 →