For an equilibrium `H_(2)O(s)hArrH_(2)O(l),` which of the following statements is ture ?

Options

A. The pressure changes do not affect the equilibrium
B. More of ice melts if pressure on the system is increased
C. More of liquid freezes if prssure on the system is increased
D. Less of ice melts if the pressure on the system is increased.

Answer

To determine which statement is true regarding the equilibrium \( H_2O(s) \rightleftharpoons H_2O(l) \), we will analyze each statement based on the principles of chemical equilibrium and the effects of pressure on phase changes.

### Step-by-Step Solution:

1. **Understanding the Equilibrium**:
The equilibrium \( H_2O(s) \rightleftharpoons H_2O(l) \) represents the phase change of ice (solid water) melting into liquid water.

2. **Effect of Pressure on Equilibrium**:
According to Le Chatelier's principle, if an external change is applied to a system at equilibrium, the system will adjust to counteract that change. In the case of phase changes involving solids and liquids, pressure can significantly affect the equilibrium position.

3. **Analyzing the Statements**:
- **Statement 1**: "The pressure changes do not affect the equilibrium."
- This statement is **false**. Pressure changes do affect the equilibrium, especially in systems involving solids and liquids.

- **Statement 2**: "More of ice melts if the pressure on the system is increased."
- This statement is **true**. Increasing pressure favors the formation of the phase with a smaller volume. Since liquid water has a smaller volume than ice, increasing pressure will shift the equilibrium to the right, resulting in more ice melting into liquid water.

- **Statement 3**: "More of the liquid freezes if pressure on the system is increased."
- This statement is **false**. As established, increasing pressure favors melting rather than freezing in this equilibrium.

- **Statement 4**: "Less of ice melts if the pressure on the system is increased."
- This statement is **false**. As explained, increasing pressure leads to more ice melting, not less.

4. **Conclusion**:
The only true statement regarding the equilibrium \( H_2O(s) \rightleftharpoons H_2O(l) \) is **Statement 2**: "More of ice melts if the pressure on the system is increased."

### Summary:
The correct answer is Statement 2.