Question

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?
A.${N_2}O$
B.${N_2}{O_5}$
C.$NO$
D.$N{O_2}$

Answer 1

Hint: Nitrogen Oxides ($N{O_x}$) are the different oxides of nitrogen formed due to the reaction of nitrogen and oxygen at high temperature. The oxides that are generally formed in such processes include, $NO$ and $N{O_2}$ . ${N_2}O$ on the other hand is also known as ‘laughing gas’.

Complete step by step answer:
To answer this question, we shall analyse each option and the effect of those substances on our environment.
Option A or ${N_2}O$ is released from agricultural waste and is 300 times more potent in destroying the ozone layer. Hence, option A is not the correct answer.
Option B or ${N_2}{O_5}$ is also known as nitrogen peroxide. It is a strong oxidiser and is used in nitration of organic compounds. It does not pollute the environment. Thus, ${N_2}{O_5}$ is not a pollutant.
Option C or $NO$ is colourless and odourless gas that is converted to $N{O_2}$ in the atmosphere. It causes acid rain as well as respiratory diseases. So, option C is not the right answer.
Option D or $N{O_2}$ , studies have shown long term exposure to $N{O_2}$ affects the functioning of lungs and causes respiratory diseases. It is also one of the major gases causing the acid rain.

Hence, the only oxide that doesn’t cause pollution is option B.

Note:
 1. About 40% of nitrous oxide emissions come from human activities, which are majorly agricultural processes.
2. Major sources of $N{O_x}$ pollution include vehicle emissions, agricultural releases, and industrial processes.
3. These gases cause respiratory illness such as inflammation of the lungs. These gases are also harmful to the eyes and cause irritation to the eyes.