Answer: Toxicity
Step-by-step explanation:
Chemical property is defined as the property of a substance which becomes evident during chemical change in which a change in chemical composition takes place. A new substance is formed in these reactions. Example: Toxicity
Physical property is defined as the property of a substance which becomes evident during physical change in which there is alteration in shape, size etc. No new substance gets formed during physical change. Example: Density, Melting point, Solubility
Thus the chemical property is toxicity.