Chemical properties are observed in a reaction where a new susbstance is formed. The reactivity of a substance is considered a chemical property. Thus, option b is correct.
What are chemical properties?
Chemical properties are the observable and measurable characteristics that are seen when a substance undergoes a chemical reaction. It involves the formation of a new substance.
The heat of combustion, reactivity, flammability, enthalpy, toxicity, etc., are chemical properties as they involve the change in the substance that can't be reversed.
The density, boiling point, and conductivity are physical properties that are observed and visible even when the substance does not undergo any reaction.
Therefore, in option b, the reactivity is the chemical property.
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