A) Ammonia
B) Methane
C) Oxygen
D) Hydrogen
Correct Answer: A
Solution :
Prebiotic atmosphere was reducing in nature. Primitive atmosphere contained gases like \[\text{C}{{\text{O}}_{\text{2}}}\text{,}\,\text{CO,}\,\text{N,}\,{{\text{H}}_{\text{2}}}\,\text{N}{{\text{H}}_{\text{3}}}\text{,}\]etc. Water vapour and metallic carbites reacted to form \[\text{C}{{\text{H}}_{\text{4}}}\text{.}\]There was no oxygen present at that time. With the addition of \[{{\text{O}}_{2}}\] in the atmosphere, it became oxidising in nature and \[\text{C}{{\text{H}}_{\text{4}}}\]and \[\text{N}{{\text{H}}_{\text{3}}}\] \[\text{N}{{\text{H}}_{\text{3}}}\]began to disappear as they got oxidised forming \[\text{C}{{\text{O}}_{\text{2}}}\]and \[{{\text{N}}_{2}}\]respectively.
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