In the stratosphere, CFCs release chlorine free radicals (Cl) which reacts with O₃ to give chlorine dioxide radicals

It is a toxic gas and its reaction with NO gives NO₂.

In the atmosphere, it is depleted by CFCs

In the stratosphere, it forms a protective shield against UV radiation

for sustaining life in a water body.

by anaerobic bacteria to breakdown inorganic waste present in a water body.

for the photochemical breakdown of waste present in 1 m³ volume of a water body.

by bacteria to break-down organic waste in a certain volume of a water sample.

(a), (b), (c) and (d)

(a) and (d)

(a), (b), (c) and (e)

(a), (c), (d) and (e)

acrolein

ozone

sulphur dioxide

nitrogen oxides