QAChemistry › Which highly reactive gas was probably absent from the Earth’s primitive atmosphere?
Q

Which highly reactive gas was probably absent from the Earth’s primitive atmosphere?

A. O2 (oxygen gas)

B. Water vapor

C. Methane

D. Carbon dioxide

A

Answer: A. O2 (oxygen gas)

Oxygen gas was most likely not present in the primitive atmosphere of the earth. The atmosphere of primitive earth was composed mainly of carbon dioxide and methane as a result of the high level of volcanic activity that existed then. The activities of bacteria, one of which involves their distinct photosynthetic power, was what caused the enrichment of the earth’s atmosphere with oxygen.

6 months ago
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