Among the options provided, the correct answer is d) lead becomes a liquid when heated to 601 degrees Celsius.
This is an example of a physical property because it describes a characteristic of lead that can be observed or measured without changing the substance’s chemical identity. Physical properties include characteristics like melting points, boiling points, density, and color.
On the other hand, options a) corrosiveness of sulfuric acid, b) toxicity of cyanide, and c) flammability of gasoline are all examples of chemical properties. These properties describe how a substance interacts with other substances or how it changes in chemical composition in various reactions.