The major constituent of air is –

A. nitrogen
B. carbon dioxide
C. oxygen
D. hydrogen
Answer» A. nitrogen
Explanation: Depending on various geographical locations these may change, but for the most part air is made up of 78% nitrogen (N2), 21% oxygen (O2), and trace amounts of carbon dioxide (CO2), methane (CH4) hydrogen (H2), argon (AO and helium (He). The CO2, CH4, H2, Ar, and He, when combined together, make up about 1% of our air. Nitrogen is a chemical element with symbol N and atomic number 7. Elemental nitrogen is a colourless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09% by volume of Earth's atmosphere.
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