Answer : The correct option is, ability to decompose.
Explanation :
Chemical change : It is defined as the characteristic of substance that is observed during the chemical reaction when the chemical composition of the substance changes.
For example : flammability, toxicity, acidity, reactivity, heat of combustion, etc.
Physical change : It is defined as the characteristic of substance that is observed during the phase change that means it can be measured when a substance does not change its composition.
For example : color, smell, freezing point, boiling point, melting point, viscosity, density, etc.
From the given options we conclude that, the option ability to decompose is an example of chemical property while the other options are of the physical property.
Hence, the correct option is, ability to decompose.