Question

Recent astronomical findings suggest that the earth's early atmosphere may have contained

• A. $C{O}_2$
• B. CO
• C. Nitrogen
• D. All of these

Answer 1

The correct option is D All of these

Evolution of the atmosphere, the development of Earth’s atmosphere across geologic time. The process by which the current atmosphere arose from earlier conditions is complex; however, evidence related to the evolution of Earth’s atmosphere, though indirect, is abundant. Earth’s original atmosphere was rich in methane, ammonia, water vapour, and the noble gas neon, but it lacked free oxygen. Earth contained nitrogen in molecular form, i.e, N${}_2$ along with hydrogen (H${}_2$), methane (CH${}_4$), carbon monoxide (CO), ammonia (NH${}_3$), nitrous oxide (N${}_2$O), nitrogen dioxide (NO${}_2$), etc.

So the correct option is 'all of these'.