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What is the difference between coal tar, coke and coal gas?

COAL TAR: Coal tar is a foul smelling,dark brown liquid. On fractional distillation it furnishes a number of useful organic compounds that are used for making dyes and explosives.
COKE: Coke is an amorphous form of carbon. It is a black,porous,solid substance that burns without smoke. It contains about 98% carbon. It is a good reducing agent and a bad conductor of heat and electricity. Coke is prepared by the destructive distillation of coal.
COAL GAS: Purified coal gas is used as an industrial and a household fuel.

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COAL TAR: Coal tar is a foul smelling,dark brown liquid. On fractional distillation it furnishes a number of useful organic compounds that are used for making dyes and explosives.?
COKE: Coke is an amorphous form of carbon. It is a black,porous,solid substance that burns without smoke. It contains about 98% carbon. It is a good reducing agent and a bad conductor of heat and electricity. Coke is prepared by the destructive distillation of coal.?
COAL GAS: Purified coal gas is used as an industrial and a household fuel.
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COAL TAR: Coal tar is a foul smelling,dark brown liquid. On fractional distillation it furnishes a number of useful organic compounds that are used for making dyes and explosives.?
COKE: Coke is an amorphous form of carbon. It is a black,porous,solid substance that burns without smoke. It contains about 98% carbon. It is a good reducing agent and a bad conductor of heat and electricity. Coke is prepared by the destructive distillation of coal.?
COAL GAS: Purified coal gas is used as an industrial and a household fuel.
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But all of these are coal products.
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Robbers in a car travelling at 20m/s,pass a police man on a motor cycle at rest .The police man immidiately chasing the robbers,the policeman accelerates at 3m/s^2 for 12s and there after travels at constant velocity.Calculate the distance covered by policeman before he overtakes the car.
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