Answers

2016-03-11T18:52:27+05:30
because it produces only heat and do not catch fire and it burns completely leaving no residues behind.
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2016-03-12T00:18:07+05:30
 charcoal produces only heat and do not catch fire and it burns completely leaving no residues behind.because it is the purest form of coal and has no substance in it which reduce energy by releasing
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