17. Which of these is not found in coal?
Carbon[ ]
Oxygen[ ]
Nitrogen[ ]
Chlorine[ ]
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4
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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.
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7
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ANSWER
Coal is the substance composed of mainly carbon. Hydrogen, nitrogen, sulfur, and oxygen also present as impurities. Anthracite has the most carbon, while lignite is the lowest in carbon, but highest in hydrogen and oxygen.
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