In case of chemical adsorption,

Options

A. It continuously increases with increases in temperature
B. It continuously decreases with decreases in temperature
C. It increases with increase in temperature in low temperature zone than-decreases
D. Adsirption is not effected by the temperature.

Answer

### Step-by-Step Solution:

1. **Understanding Chemical Adsorption**:
- Chemical adsorption refers to the process where adsorbate molecules form a chemical bond with the surface of the adsorbent. This process involves the formation of stronger bonds compared to physical adsorption.

2. **Effect of Temperature on Chemical Adsorption**:
- As temperature increases, the kinetic energy of the molecules also increases. This can lead to an increase in the rate of adsorption initially because more molecules have the energy to overcome the activation energy barrier required for the formation of chemical bonds.

3. **Behavior at Low Temperatures**:
- At low temperatures, the increase in temperature leads to an increase in the extent of chemical adsorption because the molecules are more likely to collide with the surface and form bonds.

4. **Behavior at High Temperatures**:
- However, at higher temperatures, the increased kinetic energy can cause the adsorbed molecules to break free from the surface, leading to a decrease in the extent of adsorption. This is due to the fact that the energy provided at high temperatures can overcome the binding energy of the chemical bonds formed.

5. **Graphical Representation**:
- A graph can be drawn with temperature on the x-axis and the extent of chemical adsorption on the y-axis. Initially, the curve rises as temperature increases (indicating increased adsorption), reaches a peak, and then starts to decline as temperature continues to rise.

6. **Conclusion**:
- Therefore, the correct statement regarding chemical adsorption is that it increases with an increase in temperature in the low-temperature zone and then decreases at higher temperatures. This corresponds to option 3.

### Final Answer:
The correct option is **Option 3**: It increases with increases in temperature in the low-temperature zone then decreases.

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