State briefly the reactions causing ozone layer depletion in the stratosphere.

Give the reactions involved for 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

The ozone in the stratosphere is destroyed by.