According to le-Chatelier's principle, adding heat to a solid and liquid in equilibrium will cause the

Options

A. temperature to increase.
B. temperature to decrease
C. amount of liquid to decrease
D. amount of solid to decrease

Explanation

To solve the question regarding the effect of adding heat to a solid and liquid in equilibrium according to Le Chatelier's principle, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Equilibrium**:
- We start with a system where a solid is in equilibrium with its liquid form. This can be represented as:
\[ \text{Solid} \rightleftharpoons \text{Liquid} \]

2. **Effect of Adding Heat**:
- Adding heat to the system increases the temperature. According to Le Chatelier's principle, if a system at equilibrium is subjected to a change (in this case, an increase in temperature), the equilibrium will shift to counteract that change.

3. **Nature of the Process**:
- The process of a solid melting into a liquid is an endothermic reaction, meaning it absorbs heat. Therefore, when heat is added, the equilibrium will shift to favor the formation of more liquid.

4. **Direction of the Shift**:
- Since the addition of heat favors the endothermic direction (solid to liquid), the equilibrium will shift to the right, resulting in the production of more liquid.

5. **Consequences of the Shift**:
- As the equilibrium shifts to the right:
- The amount of liquid will increase.
- The amount of solid will decrease as it melts into the liquid.

6. **Conclusion**:
- Therefore, the correct answer to the question is that the amount of solid will decrease, and the amount of liquid will increase.

### Final Answer:
- **The amount of solid will decrease.**

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