which of these is a chemical property of a substance?\no texture\no ductility\no reactivity\no conductivity

Brief Explanations:

Texture is a physical - appearance related property. Ductility is the ability to be drawn into wires, a physical property. Conductivity is related to the flow of electricity or heat, a physical property. Reactivity is the ability of a substance to undergo a chemical change, a chemical property.

Answer:

C. reactivity