The purest form of coal is a) coal tar b) coke c) char coal d) coal gas
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Coal contains a number of elements such as carbon, hydrogen, oxygen, nitrogen and sulphur. When coal is heated in the absence of air, a number of products are obtained. (1) Coke: contains 98 % carbon. It is porous, tough, black and the purest form of coal.
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it's anthracite. .........
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