Odor of a substance is an example of which type of property?

Odor is classified as a physical property because it can be observed and measured without changing the substance's chemical composition. Physical properties are characteristics that can be observed or measured without altering the substance itself, such as color, density, melting point, boiling point, and, indeed, odor. When you detect the smell of a substance, you are observing a characteristic that reveals information about the substance, but that observation does not change the substance in any way.

In contrast, chemical properties relate to a substance's ability to undergo specific chemical changes, such as reactivity with acids, flammability, or the ability to rust. These properties would require a chemical change to be assessed. The other options, "mixed property" and "organic property," do not accurately describe the nature of odor in the context of physical and chemical properties. Mixed property is not a standard term in this context, while organic property is more related to compounds that contain carbon, which does not specifically pertain to the classification of odor.