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ICSE Class 10 Chemistry Question 11 of 69

Study of Compounds — Ammonia — Question 30

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Question 30

State what are chlorofluorocarbons and give their use. Give a reason why they are ozone depleting. State a suitable alternative to chlorofluorocarbons which are non-ozone depleting.

Answer

Chlorofluorocarbons (CFC’s) are compounds of carbon with chlorine or fluorine. CFC are chemicals which like liquefied ammonia gas are used in refrigeration gas.

They enter the atmosphere due to their use as coolants in refrigeration and A/C plants and aerosol sprays and cause ozone depletion in the atmosphere.

Chlorofluorocarbons (CFC’s) are decomposed by U.V. rays to give free Cl radicals.

CFCl3 ⟶ Cl atom

This Cl atom breaks the ozone layer causing ozone depletion.

Cl + O3 [ozone] ⟶ ClO + O2

Hence, ozone layer located in the stratosphere above the earth, which prevents harmful U.V. rays from reaching the earth, gets depleted.

Suitable alternatives to chlorofluorocarbons which are non-ozone depleting include Hydrochlorofluorocarbons [HCFC]