A) Methane
B) Oxygen
C) Hydrogen
D) Water vapour
Correct Answer: B
Solution :
According to Oparin, the atmosphere of primitive earth was reducing because H atoms were most numerous and most reactive. Large quantities of \[{{H}_{2}},\,{{N}_{2}}\] water vapour, \[C{{O}_{2}},\,C{{H}_{4}}\] and \[N{{H}_{3}}\] were present but free oxygen was not present in significant amount.
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