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Question
Which of the following gas that was least present in the earth's atmosphere over 2 billion years ago?
Which of the following gas that was least present in the earth's atmosphere over 2 billion years ago?
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Solution
The correct option is B Oxygen
The primitive reducing atmosphere of earth was rich in water vapour, carbon monoxide, carbon dioxide, nitrogen and hydrogen. The primitive reducing atmosphere of earth was rich in water vapour, carbon monoxide, carbon dioxide, nitrogen and hydrogen. An oxygen was absent in the primitive atmosphere. Thus, the correct answer is option B.
The primitive reducing atmosphere of earth was rich in water vapour, carbon monoxide, carbon dioxide, nitrogen and hydrogen. The primitive reducing atmosphere of earth was rich in water vapour, carbon monoxide, carbon dioxide, nitrogen and hydrogen. An oxygen was absent in the primitive atmosphere. Thus, the correct answer is option B.
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