Incorrect statement is (`K_(H)` = Henry's constant)

Options

A. `K_(H)` is a characteristic constant for a given gas solvent system
B. Higher is the value of `K_(H)`, lower is solubility of gas for a given partial pressure of gas
C. `K_(H)` has temperature dependence
D. `K_(H)` decreases with temperature

Answer

To solve the question regarding the incorrect statement about Henry's constant (K_H), we will analyze the statements one by one and determine their validity.

### Step-by-Step Solution:

1. **Understanding Henry's Law**:
- Henry's Law states that at a constant temperature, the amount of gas that dissolves in a liquid is directly proportional to the partial pressure of that gas above the liquid. This can be mathematically expressed as:
\[ P = K_H \cdot x \]
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.

**Hint**: Remember that Henry's Law relates the solubility of a gas to its partial pressure.

2. **Analyzing the Statements**:
- **Statement 1**: "K_H is a characteristic constant for a given gas-solvent system."
- This statement is **true**. Henry's constant is specific to each gas-solvent combination.

**Hint**: Consider how different gases behave differently in various solvents.

- **Statement 2**: "Higher the value of K_H, lower is the solubility of a gas for a given partial pressure."
- This statement is also **true**. If \( K_H \) increases, the mole fraction \( x \) must decrease for the same partial pressure, indicating lower solubility.

**Hint**: Think about the inverse relationship between \( K_H \) and solubility.

- **Statement 3**: "K_H has a temperature dependency."
- This statement is **true**. The value of Henry's constant can change with temperature.

**Hint**: Consider how temperature affects gas solubility in liquids.

- **Statement 4**: "K_H decreases with temperature."
- This statement is **false**. Generally, as temperature increases, the solubility of gases in liquids increases, which means \( K_H \) actually decreases.

**Hint**: Reflect on how heating a solution affects the solubility of gases.

3. **Conclusion**:
- The incorrect statement is: "K_H decreases with temperature." This is the answer to the question.

### Final Answer:
The incorrect statement is: "K_H decreases with temperature."