Which was not present in primitive atmosphere?

C H_{4}

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N H_{3}

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Water vapour

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None of the above

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Solution

The correct option is D None of the above
The primitive atmosphere was reducing and major gases present were, water vapour, methane and ammonia. Free oxygen was not present but was chemically bound to hydrogen in water and carbon as carbon di and mono-oxide form. Thus the correct answer is option D.

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