Final answer:
The statement 'Oxygen is the most plentiful gas in the air' is false. Nitrogen is the most abundant gas in the atmosphere, composing about 78%, while oxygen makes up around 21%.
Step-by-step explanation:
The statement 'Oxygen is the most plentiful gas in the air' is false. While oxygen is one of the major components of the atmosphere, the most abundant gas in the atmosphere is actually nitrogen. Nitrogen makes up about 78% of the Earth's atmosphere, while oxygen contributes only approximately 21%.
These percentages can vary slightly depending upon altitude and weather conditions, but nitrogen usually retains its status as the most abundant gas. Therefore, while oxygen is essential for most life forms on Earth, it is not the most plentiful gas in the air.
Learn more about Gases in the atmosphere