Coal is a substance mainly containing carbon also having oxygen, hydrogen, nitrogen and _______.
sodium
chlorine
aluminium
sulphur
A
aluminium
B
sodium
C
sulphur
D
chlorine
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Solution
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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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