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State whether the following statements are true or false: (a) Coke is almost pure from carbon. (b) Coal tar is a mixture of various substances. (c) Kerosene is not a fossil fuel. (d) CNG is more polluting than petrol. (e) Fossil fuels can be made in the laboratory. |
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Answer» (a) This statement is True. It is a tough, porous and black substance. It is almost pure form of carbon. (b) This statement is True. Coal tar is the product of coal which is a thick black liquid having an unpleasant smell. It is a mixture of about 200 substances. (c) This statement is False. Kerosene is a fossil fuel. It is used as a fuel for stoves, lamps and for jet aircrafts. (d) This statement is False. CNG is less polluting than petrol. It is a clean burning fuel. It produces 45% less hydrocarbons than petrol. (e) This statement is False. The formation of fossil fuels is a very slow process. These are formed under very high pressure and high temperature. The conditions for their formation cannot be created in the laboratory. |
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