Question

At an altitude of about 20 to 50 km, the ultra violet rays from the sun splits up ordinary oxygen molecules to single atom oxygen molecules, which reacts with ordinary oxygen molecules to form tri atomic ozone gas. This process is called :

• A. oxidation
• B. Nitration
• C. Ozonisation
• D. conduction

Answer 1

Answer:

C. Ozonisation

Ozone-An Umbrella for the Earth

Ozone Layer

Ozone gas, concentrated in the upper atmosphere as a layer is called Ozone layer. It protects the life forms of the earth by absorbing the harmful ultraviolet rays from the sun.

Formation of Ozone

At an altitude of about 20 to 50 km, the ultra violet rays from the sun splits up ordinary oxygen molecules to single atom oxygen molecules, which reacts with ordinary oxygen molecules to form tri atomic ozone gas. This process is called as Ozonisation

Ozone depletion

• Refrigerators, air conditioners, different types of sprays, fire extinguishers, paints, etc. Are sources of gases such as chlorofluorocarbons, halon etc. Which on rising to the upper atmosphere react with ultraviolet rays to form chlorine and bromine. Each chlorine atom is capable to decay about one lakh of ozone molecules. Bromine is 40 times more reactive than chlorine. This depletion in the atmospheric ozone layer is called as Ozone hole.

• 16th September of every year is observed as World Ozone Day