Q3 of 45 Page 543

Name the group of chemical compounds which adversely affect the ozone layer.

CFCs (Chlorofluorocarbons) are the group of chemical compounds which are mostly released from industries, refrigerators and air conditioners.


These gases are responsible for the depletion of ozone layer.


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1

Which part of solar radiation is absorbed by ozone layer?

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Name the process which help in artificial removal of wastes from the body.

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A metal M belongs to 13th group in the modern periodic table. Write the valency of the metal.

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Define 1 D of power of a lens.