Formation of clouds , mist and fog are the examples of ____________.

Options

A. chemical combination of `O_(2)and H_(2)O`.
B. physical change which involves condensation of water vapour
C. physical change which involves sublimation.
D. chemical change which involves absorption of huge amounts of energy.

Explanation

To solve the question regarding the formation of clouds, mist, and fog, we need to analyze the options provided and understand the processes involved in these phenomena.

### Step-by-Step Solution:

1. **Understanding the Phenomena**:
- Clouds, mist, and fog are all forms of water in the atmosphere. They are primarily composed of tiny water droplets or ice crystals suspended in the air.

2. **Identifying the Process**:
- The formation of these phenomena involves the transition of water vapor (gas) into liquid water droplets. This process is known as condensation.

3. **Evaluating the Options**:
- **Option A**: Chemical combination of O2 and H2O - This is incorrect as the formation of clouds does not involve a chemical reaction.
- **Option B**: Physical change which involves sublimation - This is also incorrect because sublimation refers to the transition from solid to gas, which is not applicable here.
- **Option C**: Chemical change which involves absorption of huge amount of energy - This is incorrect since the formation of clouds does not involve a chemical change or significant energy absorption.
- **Option D**: Physical change which involves condensation of water vapors - This is correct as it describes the process where water vapor in the air cools and condenses into tiny droplets, forming clouds, mist, or fog.

4. **Conclusion**:
- Therefore, the correct answer to the question is **Physical change which involves condensation of water vapors**.

### Final Answer:
Formation of clouds, mist, and fog are examples of **Physical change which involves condensation of water vapors**.