The water quality of a pond was analysed and its $\mathrm{BOD}$ was found to be $4$. The pond has

Some reactions of ${\mathrm{NO}}_2$ relevant to photochemical smog formation are

Identify $\mathrm{A},\mathrm{B},\mathrm{X}$ and $\mathrm{Y}$

A. Ammonium salts produce haze in atmosphere.

B. Ozone gets produced when atmospheric oxygen reacts with chlorine radicals.

C. Polychlorinated biphenyls act as cleansing solvents.

D. ‘Blue baby’ syndrome occurs due to the presence of excess of sulphate ions in water.

Choose the correct answer from the options given below:-

Formation of photochemical smog involves the following reaction in which $\mathrm{A},\mathrm{B}$ and $\mathrm{C}$ are respectively.

(i) ${\mathrm{NO}}_2\stackrel{\mathrm{hu}}{⟶}\mathrm{A}+\mathrm{B}$

(ii) $\mathrm{B}+{\mathrm{O}}_2\to \mathrm{C}$

(iii) $\mathrm{A}+\mathrm{C}\to {\mathrm{NO}}_2+{\mathrm{O}}_2$

Choose the correct answer from the options given below:

Identify $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$ in the following reaction. (Equation not balanced)

$\mathrm{Cl}\stackrel{\bullet }{\mathrm{O}}+{\mathrm{NO}}_2\to \underset{¯}{\mathrm{X}}\stackrel{{\mathrm{H}}_2\mathrm{O}}{⟶}\underset{¯}{\mathrm{Y}}+\underset{¯}{\mathrm{Z}}$