Question

The smog is essentially caused by the presence of

• A. $O_2$ and $O_3$
• B. $O_2$ a and $N_3$
• C. oxides of sulphur and nitrogen
• D. $O_3$ and $N_2$

Answer 1

Answer: (C)

$\text{NO,}\text{N}{\text{O}}_{\text{2}}\text{,}\text{S}{\text{O}}_{\text{2}}$ and $\text{S}{\text{O}}_{\text{3}}$ are responsible for smog (environmental pollution).