A) \[{{H}_{2}}O\]
B) \[{{O}_{2}}\]
C) \[N{{H}_{3}}\]
D) \[C{{O}_{2}}\]
Correct Answer: B
Solution :
Primitive atmosphere was probably non oxygenic i.e., the earth originally had a strongly reducing atmosphere, which consists of molecular hydrogen \[({{H}_{2}})\], hydrogen compound of other elements like \[{{H}_{2}}O\]vaporous ammonia and methane.
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