Which among the following was absent in Earth's atmosphere at the time of origin of life?

N H_{3}

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H_{2}

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O_{2}

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C H_{4}

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Solution

The correct option is C $O_{2}$
Hydrogen atoms were most numerous and most reactive in primitive atmosphere. First hydrogen atoms combined with all oxygen atoms to form water and leaving no free oxygen. Thus primitive atmosphere was reducing atmosphere (without free oxygen) unlike the present oxidising atmosphere (with free oxygen).

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