Coal and petroleum Worksheet-1
A. brownish-black coal with high moisture and ash content
B. dull black coal with low moisture and ash content
C. hard coal with high heating value
A. limited B. Unlimited
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A. a by-product while extracting coal
B. a by-product in refining of petrol
C. a by-product of the process of manufacturing coke.
A. Plants and trees B. Tiny marine organisms
C. Shrubs D. Algae and fungi
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