Q. According to one of the most accepted theory, the earth atmosphere before any life had originated consists of $H_{2}O,\ H_{2},\ NH_{2}$and
A) $CH_{4}$
B) $O_{2}$
C) $N_{2}$
D) None of these
Explanation
Most accepted theory for origin of life is Oparin theory of chemical evolution. According to this hypothesis, primitive atmosphere chiefly consisting of methane, ammonia, water vapour, hydrogen gas. So,primitive atmosphere was reducing in nature.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.