Question

The substance which is not regarded as a pollutant?

• A. $N{O}_2$
• B. $C{O}_2$
• C. $O_3$
• D. Hydrocarbons

Answer 1

The correct option is B $C{O}_2$

(a) $N{O}_2$ is the major air pollutant, the end product of $N{O}_2$ is nitric aicd, which is the major component of acid rain. It can also lead to several effects such as inflammation of lung tissue.

(b) $C{O}_2$ in air is not considered as a pollutant as it does not show any deterimental effect.

(c) $O_3$ in air combines with $N{O}_2$ to form $N{O}_3$ which by several other steps causes acid rain. It also causes chest pain, coughing, throat irritation,. It also effect lung tissue.

(d) Hydrocarbons- Majortiy of harmful effects of hydrocarbons is not due to hydrocarbon itself but the photochemical reactions in which they are involved. They lead to the formation of photochemical smog which leads to eye irritation, lung irriation, it also leads to cracking of rubber and extensive damage to plant life.