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1 b. Chlorofluorocarbons
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1 a) there are many allotropes of carbon some of them are diamond, graphite
1 b) chloro flouro carbons
2 a) The greenhouse effect is caused by the atmospheric accumulation of gases such as carbon dioxide and methane, which contain some of the heat emitted from Earth's surface.
2b) a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants is called global warming.
7a) PH value of neutral solution is 7
7b) slaked lime is sprinkled to control the PH value of the field
8 a) valency of carbon is 4
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