Question

Which of the following statements are correct about adsorption from solution phase? I. The extent of adsorption decreases with an increase in temperature II. The extent of adsorption depends upon the concentration of solute in solution III. The extent of adsorption depends on nature of adsorbate and adsorbent

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

Hint:

Adsorption is always exothermic and influenced by surface interactions!

Answer 1

The Correct Option is A

Step 1: Set up the question.
We are judging three statements about how a solid pulls solute out of a solution onto its surface. Let us test each one.

Step 2: Check statement I about temperature.
Adsorption releases heat, so it is exothermic. By Le Chatelier's idea, heating pushes molecules off the surface, so the amount adsorbed drops as temperature rises. Statement I is correct.

Step 3: Check statement II about concentration.
The more solute floating in the solution, the more often it bumps into the surface and sticks. So adsorption grows with the solute concentration. Statement II is correct.

Step 4: Check statement III about nature.
Different solids and different solutes have different surface attractions and surface areas. So the nature of both the adsorbent and the adsorbate clearly matters. Statement III is correct.

Step 5: Combine.
All three statements hold true.

Step 6: Conclusion.
So the answer is I, II, III. \[ \boxed{\text{I, II, III}} \]