Which of the following is not considered a hazardous property of a chemical?

Hardness is not considered a hazardous property of a chemical because it describes the physical characteristics of a material rather than its potential to cause harm in a chemical or biological context. In contrast, toxicity, flammability, and corrosiveness are intrinsic properties that indicate a substance's risk for health, safety, and environmental impacts.

• Toxicity refers to the degree to which a substance can harm living organisms, highlighting potential health risks upon exposure.

• Flammability involves the ability of a chemical to ignite and burn, posing fire hazards in various situations.

• Corrosiveness indicates a substance's capacity to damage or destroy living tissue or other materials through chemical reactions.

These properties are crucial for assessing the safety and handling requirements of chemicals in laboratory and industrial settings, whereas hardness simply informs about the material's durability or resistance to deformation, which isn't directly related to hazardous effects.