1) The percentage of oxygen in dry air is
A. 0.1
B. 1.0
C. 21
D. 79
...
Chemistry, 03.07.2021 15:30 ahmedeldyame
1) The percentage of oxygen in dry air is
A. 0.1
B. 1.0
C. 21
D. 79
2) The composition of the Earth’s earliest atmosphere was different to that of the present atmosphere. Which of these gases was present in large amounts in the Earth’s earliest atmosphere?
A. Oxygen
B. Carbon dioxide
C. Ammonia
D. Nitrogen
Answers: 2
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