Question

The $C{{O}_{2}}$ content by volume, in the atmospheric air, is about
(a)3.34%
(b)4%
(c)0.0314%
(d)2.1%

Answer 1

Hint: In the atmosphere, the composition of nitrogen is 78.08%, oxygen 20.95%, argon 0.93%, and rest for the carbon dioxide. Carbon dioxide is essential for a green plant for photosynthesis.

Complete answer:
The atmosphere is a mixture of permanent and variable gases and aerosols. Where permanent constituents gases like nitrogen, oxygen, argon, neon, helium, krypton, hydrogen should remain essentially constant by percent. Variable constituents are those gases that have to change concentration over a finite time, for example, water vapor, carbon dioxide, methane, ozone, etc.

Additional Information: -Carbon dioxide is a colorless and odorless gas where the carbon atoms are covalently double bonded to two oxygen atoms.
-Carbon dioxide is generated as a by-product of the combustion of fossil fuel or the burning of vegetable matter, among other chemical processes.
-Carbon dioxide has no liquid state at a pressure below 5.1 atm but at 1 atm the gas deposits directly to a solid start temperature below -78˚C and known as dry ice.
-Carbon dioxide is a waste product in humans where 1% of toxic carbon dioxide causes drowsiness and 7% to 10% of toxicity causes dizziness, headache, visual and hearing dysfunction, and unconsciousness within a few minutes.
So, the correct answer is, ‘0.0314%.’

Note: -Carbon dioxide is also used as a food additive used as a propellant and acidity regulator in the food industry.
-Carbon dioxide can be mixed with argon as a shielding gas used to prevent atmospheric contamination of molten metal in electric arc welding processes.
-The carbon dioxide used in extinguishing flames especially for electrical fires contains liquid carbon dioxide under pressure.