Which was absent/ least abundant in the 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 B $O_{2}$
Ammonia, methane and hydrogen sulfide were present in the earth's atmosphere, but no oxygen.
The correct option is C.

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Absent/least abundant in the atmosphere during origin of life

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

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