A) Oxygen
B) Ammonia
C) Hydrogen
D) Methane
Correct Answer: A
Solution :
The early atmosphere was without free oxygen (reducing). It was bound in water, \[C{{O}_{2}}\], CO and in metallic oxides on the surface rock and particles. Because of the absence of oxygen, any complex organic compounds that arose during early time were not subjected to degradation. Hydrogen was present in abundance in early atmosphere. It readily combines with nitrogen forming ammonia, with oxygen forming water and with carbon forming methane. Thus, early atmosphere of earth was strongly reducing. It contained hydrogen, methane, ammonia and water vapours.
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