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NALGGNUL, , Class-VIIl (CHAPTER-05) Coal and Petroleum, Answers, , The advantages of using compressed natural gas (CNG) and, , liquified petroleum gas (LPG) as fuels is as follows:, , (a) CNG and LPG can be burnt directly., , (b) CNG and LPG can be transported through pipelines easily., , (c) CNG and LPG do not emit smoke when burnt, as they are, clean fuels., , (d) CNG and LPG produces huge amount of energy., , Bitumen is the petroleum product used for surfacing roads., , Coal is formed from dead remains of plants and animals which, , are buried in the soil exposed to high temperature and pressure, , in the absence of air. The process of formation of coal is known, , as carbonization., , (a) Fossil fuels are coal, petroleum and natural gas., , (b) Process of separation of different constituents from petroleum, is called refining., , (c) Least polluting fuel for vehicles is compressed natural gas, (CNG)., , (a) Fossil fuels can be made in the laboratory. (F), , (b) CNG is more polluting fuel than petrol. (F), , Nedart, , (c) Coke is almost pure form of carbon. (T), , (d) Coal tar is a mixture of various substances. (T), , (e) Kerosene is not a fossil fuel. (F), , Fossil fuels are formed from dead remains of plants and animals, buried in the soil millions of years ago under high temperature, and pressure, which cannot be synthesized in the laboratory., Thus, fossil fuels are exhaustible natural resources., , Coke is a substance formed from destructive distillation of coal. It, is Tough, Porous, Black in colour. It is used in manufacturing of, steel and extraction of metals as a reducing agent., , Petroleum is formed from dead remains of plants and animals, buried in the soil millions of years ago under high temperature, and pressure in the absence of air the dead remains are broken, into smaller units to form petroleum and natural gas., , Shortage (%) ——>, , , , 1997, , - ao t wo, ra RAR HR K, aA eA SH &, , Year——>