Which of the following is NOT a physical property of matter?

• A. Ability to rust
• B. Density
• C. Color
• D. Boiling point

Answer: (A)

Verified step by step guidance

1. Understand the difference between physical and chemical properties. Physical properties can be observed or measured without changing the substance's identity, while chemical properties describe a substance's ability to undergo chemical changes.
2. Review each option and determine if it involves a change in the substance's chemical identity or not.
3. Density is a physical property because it is a measure of mass per unit volume and does not involve changing the substance itself.
4. Color is a physical property because it can be observed without altering the substance's chemical composition.
5. Boiling point is a physical property because it is the temperature at which a substance changes from liquid to gas without changing its chemical identity, whereas the ability to rust involves a chemical reaction (oxidation), so it is a chemical property.