Which of the following is an example of a physical property?

• A. Ability to rust
• B. Reactivity with acid
• C. Flammability
• D. Melting point

Answer: (D)

Verified step by step guidance

1. Understand that a physical property is a characteristic of a substance that can be observed or measured without changing the substance's chemical identity.
2. Recognize that properties like ability to rust, reactivity with acid, and flammability involve chemical changes, meaning the substance undergoes a chemical reaction.
3. Identify that melting point is a physical property because it describes the temperature at which a substance changes from solid to liquid without altering its chemical composition.
4. Recall that physical properties include melting point, boiling point, density, color, and hardness, all of which can be observed without changing the substance chemically.
5. Conclude that among the given options, melting point is the example of a physical property.