Which of the following is a chemical property of aluminium?

• A. It corrodes with air
• B. It is soft and malleable
• C. It melts at 660 °C
• D. Its density is 2.7 gm cm₋₁

When discussing the chemical properties of aluminium, we focus on how it reacts with other substances. Among the options provided, the correct answer is:

A. It corrodes with air

This indicates a chemical change, as corrosion involves a reaction with oxygen in the air, leading to the formation of aluminium oxide. The other options describe physical properties:

• B. It is soft and malleable: This refers to its ability to be shaped without breaking.
• C. It melts at 660 °C: This is a physical property related to its melting point.
• D. Its density is 2.7 gm cm₋₁: This describes how much mass is contained in a given volume.

In summary, the only chemical property listed is that aluminium corrodes with air.