Question

Identify false statement among the following regarding adsorption.

• A. It is a surface phenomenon.
• B. It is an exothermic process.
• C. Gases having low critical temperature can be readily adsorbed by solid adsorbent.
• D. Colloidal substances acts as good adsorbents.

Hint:

Easily liquefiable gases with high critical temperature are adsorbed more readily, not gases with low critical temperature.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Adsorption is a surface phenomenon in which a substance gathers on the surface of a solid.
It lowers surface energy, so it is exothermic.

Step 2: Check each statement
The first two statements are true.
Colloids have a very large surface area, so they are good adsorbents.

Step 3: Find the false statement
Gases with a high critical temperature are easily liquefied and have stronger van der Waals forces, so they are adsorbed more.
Gases with low critical temperature are adsorbed less, which makes the third statement false.

Final Answer:
The false statement is that gases with low critical temperature are readily adsorbed. \[ \boxed{\text{(C) }\text{Gases having low critical temperature can be readily adsorbed by solid adsorbent.}} \]