The favourable conditions for melting of ice is

Options

A. Low pressure
B. High pressure
C. low temperature
D. Absence of catalyst

Answer

To determine the favorable conditions for the melting of ice, we can analyze the process of melting in terms of thermodynamics and the phase equilibrium of water and ice. Here’s a step-by-step solution:

### Step 1: Understand the Process of Melting
Melting of ice is an endothermic process, meaning it requires the absorption of heat energy. When ice melts, it transitions from a solid state to a liquid state.

**Hint:** Remember that endothermic reactions absorb heat, while exothermic reactions release heat.

### Step 2: Identify the Role of Temperature
For melting to occur, the temperature must be sufficiently high. As the temperature increases, the kinetic energy of the molecules in the ice increases, allowing them to overcome the intermolecular forces holding them in a solid state.

**Hint:** Think about how temperature affects molecular motion; higher temperatures mean more energy and movement.

### Step 3: Consider the Effect of Pressure
According to the phase diagram of water, increasing pressure can also favor the melting of ice. This is somewhat counterintuitive since most solids become denser than their liquid forms, but water is an exception. Under high pressure, ice can melt at lower temperatures than it would at normal atmospheric pressure.

**Hint:** Recall that for substances like water, increasing pressure can shift the equilibrium towards the liquid phase.

### Step 4: Evaluate the Options
1. **Low Temperature**: This is not favorable as it would slow down the melting process.
2. **High Pressure**: This is favorable as it can facilitate the melting of ice.
3. **Low Pressure**: This is not favorable as it would not promote melting.
4. **Absence of Catalyst**: Catalysts do not affect the melting of ice, so this is irrelevant.

**Hint:** Analyze each option based on the principles of thermodynamics and phase changes.

### Step 5: Conclusion
The favorable conditions for melting ice are **high temperature and high pressure**. Among the options provided, **high pressure** is the correct answer.

### Final Answer:
The favorable condition for melting of ice is **high pressure** (Option 2).

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