What is one of the key chemical properties of carbon dioxide?

Carbon dioxide is known for its inability to support combustion, which distinguishes it from other gases such as oxygen. When a flame is introduced to carbon dioxide, the gas acts as a fire suppressant and will extinguish the flame. This characteristic is significant in various applications, including fire extinguishers, where carbon dioxide is used to smother fires effectively.

In contrast, the other options do not accurately describe carbon dioxide's properties. For example, it does not exhibit a strong acidic nature compared to other substances, nor does it react vigorously with metals, and it clearly does not support combustion, which is a defining aspect of its chemical behavior. Understanding this property is crucial in fields like environmental science, where the role of carbon dioxide in the atmosphere and its interactions with other elements are studied extensively.