Which of the following is an example of an inert gas?

The concept of inert gases typically refers to gases that do not readily react with other substances under standard conditions. In this context, the correct example of an inert gas is nitrogen. Nitrogen is commonly used as a filler gas in various applications, especially in the marine industry, due to its non-reactive properties. It does not support combustion and is widely used in processes requiring an oxygen-free environment to prevent fire or explosion hazards.

While argon is also considered an inert gas and is frequently utilized in welding and other applications due to its non-reactive nature, the answer in this context is nitrogen, as it represents a more commonly recognized inert gas in multiple industrial settings. CO2, or carbon dioxide, while it may not be highly reactive, does take part in certain chemical reactions and is thus not classified as an inert gas. Oxygen is a reactive gas essential for combustion and respiration, confirming that it does not meet the criteria for being an inert gas.