Q. Which is the second most abundant gas in Earth's atmosphere ?
✅ Correct Answer: (A)
Oxygen
Explanation: The most abundant naturally occurring gas is Nitrogen which makes up about 78% of air. Oxygen is the second most abundant gas at about 21%.
Explanation by: Bhagwan Das
The most abundant naturally occurring gas is Nitrogen which makes up about 78% of air. Oxygen is the second most abundant gas at about 21%.