Question

Arrange the following gases in descending order in terms of percentage in dry air of the lower atmosphere.
(A) Carbon dioxide
(B) Argon
(C) Nitrogen
(D) Oxygen
Choose the correct answer from the options given below:

• A. (D), (C), (A), (B)
• B. (C), (A), (D), (B)
• C. (C), (D), (A), (B)
• D. (C), (D), (B), (A)

Answer 1

The Correct Option is D

The descending order of gases by percentage in dry air of the lower atmosphere, based on approximate values, is as follows: Nitrogen (N₂) comprises approximately 78.08%, Oxygen (O₂) constitutes about 20.95%, Argon (Ar) makes up roughly 0.93%, and Carbon Dioxide (CO₂) represents about 0.04%.

• Nitrogen (C) - 78.08%
• Oxygen (D) - 20.95%
• Argon (B) - 0.93%
• Carbon Dioxide (A) - 0.04%

Therefore, the correct descending order of these gases by percentage in dry air is: (C), (D), (B), (A).