Ozone acts as a shield for absorbing ultraviolet radiations from the sun.
Write the unit used to measure ozone layer.

Ozone acts as a shield for absorbing ultraviolet radiations from the sun. Name the region of atmosphere where ozone is seen.

Ozone in the stratosphere is produced by the help of ultraviolet radiations. It protects us from harmful ultraviolet radiations. a) Write equation for the formation of ozone in stratosphere.

Explain i) ozone layer acts as an umbrella for the earth against the harmful radiation from sun. ii) The wooden shelf under thé reagent bottle containing conc. H_2 SO_4 blackens after sometime. iii Precipitation of secònd group sulphides in qualitative analysis is càrried out with H_2 S in presence of HCl and not nitric acid.

"Ozone layer does not permit infrared radiation from the sun to reach the earth". State whether this statement is true or false.

"Ozone layer acts as an umbrella to the Biosphere". a. Justify the statement. b. Suggest the ways to reduce the ozone layer depletion.

Which of the following statement/s is /are wrong: (i) Nitric oxide and chlorofluoro carbons are two main ozone depleting agents. (ii) In the stratosphere CFCs undergo photochemical decomposition to produce chlorine free radical which destroy ozone layer. (iii) Ozone hole has mainly been observed in the stratosphere over Antarctica. (iv) Innon polar regions of the stratosphere, chlorine monoxide free radicals combine with NO_(2) and chlorine free radicals combine with methane, as a result the chain reaction causing ozone depletion stops v. Northern hemisphere is free from ozone depletion