Which statement is false?

Options

A. Increase in pressure increases the extent of adsorption
B. Increase in temperature may decrease the extent of adsorption
C. The adsorption may be monolayered or multilayered
D. Particle size of the adsorbent will not affect the extent of adsorption

Answer

To determine which statement is false regarding adsorption, let's analyze each option step by step.

### Step 1: Analyze Option 1
**Statement:** "Increase in pressure increases the extent of adsorption."

- **Explanation:** When pressure increases, more gas molecules collide with the surface of the adsorbent. This leads to an increase in the rate of adsorption because more molecules are available to be adsorbed. Therefore, this statement is **true**.

### Step 2: Analyze Option 2
**Statement:** "Increase in temperature may decrease the extent of adsorption."

- **Explanation:** Adsorption is generally an exothermic process, meaning it releases heat. According to Le Chatelier's principle, increasing temperature will shift the equilibrium to favor the endothermic direction, which in this case is the desorption of molecules from the surface. Hence, this statement is also **true**.

### Step 3: Analyze Option 3
**Statement:** "Adsorption may be monolayered or multilayered."

- **Explanation:** Adsorption can occur in different layers. Monolayer adsorption refers to a single layer of adsorbate molecules on the adsorbent surface, while multilayer adsorption involves multiple layers. This statement is **true**.

### Step 4: Analyze Option 4
**Statement:** "Particle size of the adsorbent will not affect the extent of adsorption."

- **Explanation:** The particle size of the adsorbent does affect the extent of adsorption. Smaller particles have a larger surface area, which provides more sites for adsorption. Thus, this statement is **false**.

### Conclusion
From the analysis, we conclude that the false statement is:
- **Option 4:** "Particle size of the adsorbent will not affect the extent of adsorption."