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Q.

The main constituent of coal is

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a

Water

b

Air

c

Oxygen

d

Carbon

answer is A.

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Detailed Solution

Coal is a combustible black (or) brownish – black sedimentary rock usually occurring in rock state in layers called coal beds and it is composed primarily carbon along with variable quantities of other elements like Hydrogen, Sulfur, Oxygen and Nitrogen.

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The main constituent of coal is