Maximum entropy will be in which of the following?

Options

A. Ice
B. Liquid water
C. Snow
D. Water vapour

Answer

To determine which state of water has the maximum entropy, we can analyze the different states of water: ice, liquid water, snow, and water vapor.

### Step-by-Step Solution:

1. **Understand Entropy**:
- Entropy is a measure of the randomness or disorder of a system. The greater the disorder, the higher the entropy.

2. **Identify the States of Water**:
- The states of water we are considering are:
- Ice (solid state)
- Liquid water (liquid state)
- Snow (solid state, similar to ice but with a different structure)
- Water vapor (gaseous state)

3. **Compare the States**:
- **Ice**: In the solid state, molecules are closely packed and have limited movement, resulting in low entropy.
- **Liquid Water**: In the liquid state, molecules are more mobile than in the solid state, leading to higher entropy than ice but lower than gases.
- **Snow**: Similar to ice, snow is also a solid with a crystalline structure, thus having low entropy.
- **Water Vapor**: In the gaseous state, molecules are far apart and move freely, resulting in the highest level of disorder and thus maximum entropy.

4. **Conclusion**:
- Among the options provided, water vapor has the highest entropy due to the increased randomness and freedom of movement of its molecules compared to the other states.

5. **Final Answer**:
- The state of water with maximum entropy is **water vapor**.