When a liquid boils , generally , there is :

Options

A. Decreases in enthalpy
B. Decrease in entropy
C. Increase in enthalpy
D. Increase in entropy

Answer

To solve the question "When a liquid boils, generally, there is:", we will analyze the process of boiling and its effects on the properties of the system involved.

### Step-by-Step Solution:

1. **Understanding Boiling**: Boiling is the process where a liquid turns into vapor when it reaches its boiling point. During this phase change, the molecules of the liquid gain enough energy to overcome intermolecular forces and enter the gaseous phase.

**Hint**: Recall that boiling occurs at a specific temperature where the vapor pressure of the liquid equals the atmospheric pressure.

2. **Entropy Concept**: Entropy is a measure of the disorder or randomness in a system. In the context of boiling, we need to consider how the state of the matter changes from liquid to gas.

**Hint**: Think about how the arrangement of molecules changes when a liquid becomes a gas.

3. **Phase Change and Randomness**: When a liquid boils, the molecules move from a relatively ordered state (liquid) to a much less ordered state (gas). This transition results in an increase in randomness.

**Hint**: Consider how the freedom of movement of molecules differs between the liquid and gaseous states.

4. **Effect on Entropy**: Since boiling increases the randomness of the molecules, it also increases the entropy of the system. Therefore, we can conclude that during boiling, the entropy increases.

**Hint**: Remember that an increase in disorder corresponds to an increase in entropy.

5. **Evaluating Options**: The options given were:
- A) Decrease in enthalpy
- B) Decrease in entropy
- C) Increase in enthalpy
- D) Increase in entropy

Based on our analysis, the correct answer is D) Increase in entropy.

**Hint**: Compare your conclusion about entropy with the options provided to ensure you select the correct one.

### Final Answer:
When a liquid boils, there is an **increase in entropy**.