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Answer in very short
(1) Where are CFCs (Chlorofluorocarbons) used ??
(2) What phenomenon is called 'Marble Cancer'? ?
(3) Which acids are present in acid rain ? ?
(4) Uses of which clean fuels are essential to reduce air pollution ??
(5) From what does the ozone layer protect us??
(6) which chemicals are added for purifying water ??
(7) state the name of some toxic chemicals released in an industrial waste.
Answer in very short
(1) Where are CFCs (Chlorofluorocarbons) used ??
(2) What phenomenon is called 'Marble Cancer'? ?
(3) Which acids are present in acid rain ? ?
(4) Uses of which clean fuels are essential to reduce air pollution ??
(5) From what does the ozone layer protect us??
(6) which chemicals are added for purifying water ??
(7) state the name of some toxic chemicals released in an industrial waste.
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• Answer:
1)They are used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, as solvents, and as refrigerants.
2)Acid rain. Hint:Marble cancer occurs due to a type of reaction of marble with a chemical compound in which the reaction is called corrosion.
3)Sulphur dioxide, nitrogen dioxide are these gases are also responsible for marble cancer.
4)Replacing the coal, wood, dung and kerosene largely used for cooking and lighting the house across rural India with a clean fuel would significantly improve India's overall air quality and save more than 2.5 lakh lives every year, suggests a new study.
5)The stratospheric ozone layer absorbs ultraviolet (UV) radiation, preventing dangerous UV rays from hitting Earth's surface and harming living organisms. UV rays cannot be seen or felt, but they are very powerful and change the chemical structure of molecules
6)chlorine.
7)Factory emissions contribute greatly to the release of carbon dioxide into the atmosphere. Industry and electrical generating factories contribute slightly more than 50 percent of greenhouse gases. Another harmful gas from the use of fossil fuels is sulfur dioxide, a key ingredient in the formation of acid rain.