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After wathing a programme on TB regarding deteriorating economy of our country mainly due to import of huge quantities of petroleum needed for obtaining gasoline/diesel for running automobiles, aeroplanes, trans, ships, etc. amit a class XII student discussed the issue with his class teacher. amit pointed out the due to the presence of nitrogen and sulphurc compounds in gasoline/diesel, the exhaust gases contain oxides of nitrogen and sulphurc which are the major pollutants of the environment. He, therefore, suggested that ethanol instead of gasoline/diesel may be used since it is a much cleaner fuel because it produces only CO_(2) and H_(2)O. After reading the above passage, answer the following questions: (i) What are values expressed by Amit? (ii) Besides being a cleaner fuel, what are the other advantages of using ethanol as a fuel in automobiles? (iii) What are the disadvantages of using ethanol as a fuel? |
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Answer» Solution :(i) Amit displayed values regarding keeping the environment clean and improving the general health of the people. (ii) the main advantages are: * It is made from renewable energy sources, i.e, sugarcane and corn which are grown in the fields. * It has higher octane rating. * due to the presence of oxygen in ethanol, poisonous gases like CO annd unburnt HYDROCARBONS are emitted to a lesser extent. * Less dependence on IMPORTED oils thereby promoting the economy of our country. (iii) The main disadvantages are: (a) it has 1/3 the energy contet as compared to gasoline. therefore, driver will need more ethanol than gasoline to drive the same distance. (b) Ethanol can absorb WATER ad dust more easily and hence corrodes engine made up of aluminium. (c) It produces cancer causing emissions such as ACETALDEHYDE and formaldehyde 40 times more than gasoline. |
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