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_____ is a fossil fuel which is hard and black in colour​

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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...

Hᴏᴘᴇ Iᴛ Hᴇʟᴘs U....

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