Extent of adsorption of adsorbate from solution phase increases with …… .

Options

A. Increase in amount of adsorbate in solution
B. decrease in surface area of adsorbent
C. increase in temperature of solution
D. decrease in amount of adsorbate in solution

Explanation

To answer the question regarding the extent of adsorption of an adsorbate from the solution phase, we can analyze the factors that influence this process. Here’s a step-by-step breakdown of the reasoning:

### Step 1: Understanding Adsorption
Adsorption is the process where molecules from a liquid or gas phase adhere to the surface of a solid (the adsorbent). The solid that is being adhered to is called the adsorbate.

### Step 2: Effect of Adsorbate Concentration
The extent of adsorption increases with an increase in the amount of adsorbate in the solution. This is because more adsorbate molecules in the solution lead to a higher probability of these molecules coming into contact with the surface of the adsorbent, thus increasing the adsorption.

### Step 3: Analyzing Other Options
1. **Decrease in Surface Area of Adsorbate**: This is incorrect. If the surface area of the adsorbent decreases, there will be less area available for adsorption, leading to a decrease in the extent of adsorption.

2. **Increase in Temperature of Solution**: This is also incorrect. Increasing the temperature can lead to the evaporation of the solvent (e.g., water), which reduces the number of adsorbate molecules available for adsorption. Thus, the extent of adsorption would decrease.

3. **Decrease in Amount of Adsorbate in Solution**: This is incorrect as well. A decrease in the amount of adsorbate would reduce the likelihood of adsorption occurring, leading to a lower extent of adsorption.

### Conclusion
The correct answer to the question is that the extent of adsorption of adsorbate from the solution phase increases with an **increase in the amount of adsorbate in solution**.