Question

The pair of chemicals that maintain heat balance in the troposphere are

(A) $C{O_2},{O_2}$
(B) ${N_2},{O_2}$
(C) ${O^ + },{O_3}$
(D) ${H_2}O,N{O^ + }$

Answer 1

Hint: The troposphere is the lowest layer of the earth’s atmosphere. It extends from the earth’s surface to an average height of about 12 km. There are loads of chemicals present in the lowest layer of earth that is the troposphere but few of them are more important in maintaining heat balance in the troposphere.
So we will study the percentage of compounds present in the troposphere and arrive at the correct answer.

Complete step by step answer:
We know that the majority of chemicals present in the lower part of the earth that is troposphere are nitrogen and oxygen which are present in larger amounts.
That is nitrogen is having a share of seventy percent and oxygen is having a share of twenty percent which is more than enough for maintaining the balance in the troposphere.
 The lower density of molecules higher up and would not give us enough oxygen to survive.
Here we conclude that the concentration of nitrogen is 78 percent and that of nitrogen is 21 percent.
Hence the correct option is B.

Additional information: The troposphere is the lowest layer of earth’s atmosphere and is surrounded by a layer of air called tropopause which separates the troposphere from the stratosphere and at the bottom by the surface of the earth. Also, carbon dioxide is present in small amounts, and chlorofluorocarbons and nitrous oxide are present but they are not active in the troposphere.

Note:
Most prevalent gases present in the troposphere are nitrogen ($78\% $) and oxygen ($28{\text{ }}\% $) while the remaining $1\% $ is argon and traces of hydrogen ozone and other constituents .the composition of the troposphere is nearly uniform.