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Qzone at the higher levels of the atmosphere is a product of UV radiation acting on oxygen (O2) molecule. The higher energy UV radiations split apart some moleculer oxygen (O2) into free oxygen (O) atoms. These atoms then combine with the molecular oxygen to form ozone.

1. What equation correctly represents formation of ozone?

a. O + O2 → O3

b. O + O2 → O2

c. O + O3 → O3

d. None of these.

2. The amount of ozone in the atmosphere began to drop sharply in the __________.

a. 1960s

b. 1980s

c. 1950s

d. None of these

3. In _____ the United Nations Environment Programme (UNEP) succeeded in forging an agreement to freeze CFC production at 1986 levels.

a. 1983

b. 1981

c. 1987

d. 1992

4. It is now mandatory for all the manufacturing companies to make _____ free refrigerators throughout the world.

a. CFC

b. FCC

c. CCF

d. CFF

5. What is the average concentration of ozone in the ozone layer of the atmosphere?

a. Nearly 100%

b. Greater than 90%

c. Between 10-50%

d. Less than 10ppm

1 Answer

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Best answer

1. a. O + O2 → O3

2. b. 1980s

3. c. 1987

4. a. CFC

5. d. Less than 10ppm

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