Environment Studies (Science) (M.Phil./Ph.D.) 2018 Panjab University Entrance Exam With Answers

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19.

The primitive atmosphere of earth consisted of

A: CO2, NO2, NH3, SO2
B: H2, NH3, CH4, H2O
C: CO, N2O3, SO3, H3N
D: He, Ne, Ar, Kr

The answer is: B

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