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According to Oparin, which one of the following was not present in the primitive atmosphere of the earth

1. Methane
2. Oxygen
3. Hydrogen
4. Water vapour

Correct answer: Oxygen

Solution

Oparin proposed that the primitive atmosphere lacked free oxygen and was reducing in nature. Methane, hydrogen, and water vapour were present, but oxygen had not yet accumulated because it was produced later by photosynthetic organisms.

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