(a) Methane
(b) Oxygen
(c) Hydrogen
(d) Water vapour
[CBSE AIPMT 2004]
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According to Oparin, which one of the following was not present in the primitive atmosphere of the earth?
According to Oparin, which one of the following was not present in the primitive atmosphere of the earth?
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Correct Option (b) Reason : According to Oparin the atmosphere of primitive earth was reducing because H atoms were most numerous end most reactive. Large quantities of H₂, N₂, water vapour, CO₂, CH₄ and NH₃ were present, but free oxygen was not present in significant amount.