A) \[{{O}_{2}}\]
B) \[{{H}_{2}}\]
C) \[{{N}_{3}}\]
D) \[N{{H}_{2}}\]
Correct Answer: A
Solution :
The atmosphere of earth at the time of origin of life was without free\[{{O}_{2}}\]. The most abundant gases are methane, carbondioxide, nitrogen and ammonia. About the exact composition of the early atmosphere one popular view is that it contained \[C{{O}_{2}},\,{{N}_{2}}\], water vapour, \[{{H}_{2}}\] and compounds in which hydrogen were bounded to other light elements (S, N, C etc.) producing\[{{H}_{2}}S,\,N{{H}_{3}},\,C{{H}_{4}}\]. We refer to such an atmosphere as a reducing atmosphere because of ample availability of hydrogen atoms and their electrons and predominance of molecules having less oxygen than hydrogen.
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