Which of the following is true for Henrys constant

Options

A. It decreases with temperature
B. It increases with temperature
C. Independent on temperature
D. It do not depend on nature of gases.

Answer

To solve the question regarding Henry's constant, we need to analyze the options provided and understand the relationship between Henry's constant (K_H), temperature, and the nature of the gas.

### Step-by-Step Solution:

1. **Understanding Henry's Law**:
Henry's Law states that the amount of gas that dissolves in a liquid at a given temperature is proportional to the partial pressure of that gas above the liquid. The mathematical representation is:
\[ P = K_H \cdot X \]
where \( P \) is the partial pressure of the gas, \( K_H \) is Henry's constant, and \( X \) is the mole fraction of the gas in the liquid.

2. **Analyzing the Options**:
- **Option A**: "Decreases with temperature" - This suggests that as temperature increases, K_H decreases.
- **Option B**: "Increases with temperature" - This suggests that as temperature increases, K_H increases.
- **Option C**: "Independent of temperature" - This suggests that K_H does not change with temperature.
- **Option D**: "Does not depend on the nature of gas" - This suggests that K_H is the same for all gases.

3. **Evaluating Temperature Dependence**:
- It is known that Henry's constant generally **increases with temperature** for most gases. This means that as temperature rises, the solubility of gases in liquids decreases, leading to a higher value of K_H.

4. **Evaluating the Nature of Gas Dependence**:
- Henry's constant is **dependent on the nature of the gas** and the solvent. Different gases have different solubility characteristics in the same solvent.

5. **Conclusion**:
Based on the analysis:
- **Correct Answer**: Option B - "Increases with temperature" is true for Henry's constant.

### Final Answer:
**Option B: It increases with temperature.**