Example of change of state are

Options

A. melting
B. rusting
C. evaporation
D. floating

Answer

To answer the question "Examples of change of state are," we will identify and explain different processes that illustrate changes in the states of matter.

### Step-by-Step Solution:

1. **Understanding Change of State**:
- A change of state refers to the transformation of a substance from one physical state to another. The main states of matter are solid, liquid, and gas.

2. **Example 1: Melting**:
- **Definition**: Melting is the process where a solid turns into a liquid.
- **Example**: Ice is a solid form of water. When ice is heated, it melts and changes into liquid water.
- **Conclusion**: This is a clear example of a change of state.

3. **Example 2: Evaporation**:
- **Definition**: Evaporation is the process where a liquid changes into a gas (or vapor).
- **Example**: When water is heated, it eventually turns into steam, which is water in its gaseous state.
- **Conclusion**: This is another example of a change of state.

4. **Example 3: Rusting**:
- **Definition**: Rusting is a chemical process where iron reacts with oxygen and moisture to form rust, a reddish-brown substance.
- **Conclusion**: Rusting does not involve a change of state; it is a chemical change, not a physical change.

5. **Example 4: Floating**:
- **Definition**: Floating refers to an object resting on the surface of a liquid.
- **Conclusion**: Floating is not a change of state; it describes the behavior of objects in liquids.

### Final Conclusion:
- The correct examples of change of state from the options provided are:
- Melting (Ice to Water)
- Evaporation (Water to Steam)