Which of the following was most likely to have been absent in free form in the primordial atmosphere at the time of origin of life?

O_{2}

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C H_{4}

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H_{2}

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N H_{3}

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Solution

The correct option is A $O_{2}$
As per Oparin and Haldane's theory, primitive atmosphere was reducing and devoid of free oxygen. In fact oxygen was poisonous to primitive life as it was strongly oxidising.

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