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  1. The major constituent of air is

    2. A.

     carbon dioxide
    B.

     nitrogen
    C.

     oxygen
    D.

     hydrogen

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    Answer : Option B

    Explanation :

    Below a height of about 86 kilometers, the three main gaseous elements, which together account for about 99.9% of the total atmosphere, exist in essentially constant proportion to the total: nitrogen comprises 78% of air by volume, oxygen comprises 21% of air by volume, and argon comprises another 0.9%.

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