Praxis 5005 Practice Question
Of the following gases, which is found in the atmosphere in the greatest concentration?
Correct Answer: B
Rationale: Nitrogen (N2) is the most abundant gas in Earth's atmosphere, making up about 78% of it. This high concentration provides stability and plays a crucial role in various biological and chemical processes.
Oxygen (O2), while vital for life, constitutes only about 21% of the atmosphere, significantly less than nitrogen.
Hydrogen (H2) is present in trace amounts, typically less than 0.00005%, and is not a major atmospheric component.
Carbon dioxide (CO2) is also present in much smaller concentrations, around 0.04%, and is primarily significant for its role in climate and plant photosynthesis.
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