Which one of the following statements is not true ?

A. London smog is oxidising in nature

B. Photochemical smog causes irritation in eyes

C. London smog is a mixture of smoke and fog

D. Photochemical smog results in the formation of $$PAN$$

A. Plants

B. Haemoglobin

C. Microorganisms present in the soil

D. Oceans

A. methane and nitrous oxide in atmosphere.

B. methane and $$C{O_2}$$  in atmosphere.

C. methane and $${O_3}$$  in atmosphere.

D. methane and $$CO$$  in atmosphere.

A. The problem of ozone depletion is less serious at poles because $$N{O_2}$$  solidifies and is not available for consuming $$CI{O^ \bullet }$$  radicals.

B. The problem of ozone depletion is more serious at poles because ice crystals in the clouds over poles act as catalyst for photochemical reactions involving the decomposition of ozone of $$C{l^ \bullet }$$  and $$CI{O^ \bullet }$$  radicals.

C. Freons, chlorofluorocarbons, are inert. Chemically, they do not react with ozone in stratosphere.

D. Oxides of nitrogen also do not react with ozone in stratosphere.