Q. The major constituent of air is:
Answer: nitrogen
Notes: Depending on various geographical locations average air composition may change, but for the most part air, it is made up of 78% nitrogen (N2), 21% oxygen (O2), and trace amounts of carbon dioxide (CO2), methane (CH4), hydrogen (H2), argon (Ar) and helium (He). The CO2, CH4, H2, Ar, and He, when combined together, make up about 1% of our air.

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