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Ozone Layer Depletion

Ozone in the ...

Question

Ozone in the stratosphere is a product of UV radiations acting on:

A

Free oxygen atoms

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B

CFCs

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C

Chlorine atoms

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D

Dioxygen molecule

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Solution

The correct option is D
Dioxygen molecule

Ozone in the stratosphere is a product of UV radiations acting on dioxygen molecule.

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Q. Assertion :Ozone in the troposphere is a product of ultraviolet radiations acting on dioxygen molecules. Reason: Ozone is thermodynamically very stable.

Q. UV rays act on chlorofluorocarbons (CFCs) and release __________ which degrades the ozone layer in the stratosphere.

Q. Assertion: Ozone is destroyed by CFCs in the upper stratosphere.
Reason: Ozone holes increase the amount of UV radiation reaching the earth.

Q. Read the following statements (A - D) related to the depletion of the ozone layer by CFCs and select the correct option stating true (T) and false (F).

A. CFCs are the most damaging agents of the ozone layer.
B. Chlorine atoms are released due to the activity of UV radiation on CFCs.
C. The active chlorine converts ozone into hydrogen atoms.
D. Cl atoms are consumed in the process of degradation of ozone.

Q. Q6. Consider the following statements
1. CFCs are Short-lived chemical compounds that eventually rise into the stratosphere; where they are broken apart by the sun’s ultraviolet radiation, releasing chlorine atoms that go on to destroy ozone molecules.
2. Tropospheric ozone protects life on the planet by absorbing potentially harmful ultraviolet radiation that can cause skin cancer and cataracts, suppress immune systems and damage plant life.
Choose the incorrect statements from the options given below

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