Which among the following types of coal produces the most heat per unit?a)Coalb)Lignitec)Anthracited)Pite)None of the above / More than one of the aboveCorrect answer is option 'C'. Can you explain this answer?

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Which among the following types of coal produces the most heat per unit?

a)
Coal
b)
Lignite
c)
Anthracite
d)
Pit
e)
None of the above / More than one of the above

Correct answer is option 'C'. Can you explain this answer?

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Which among the following types of coal produces the most heat per un...

The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.

Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite.
The heat content of anthracite ranges from 22 to 28 million Btu per short ton (26 to 33 MJ/kg) on a moist, mineral-matter-free basis.

Anthracite (“coallike”) is a hard, compact variety of mineral coal that has a high luster.

It has the highest carbon content, the fewest impurities, and the highest calorific content of all types of coals, which also include bitu-minous coal and lignite.
Anthracite is the most metamorphosed type of coal (but still represents low-grade meta-morphism), in which the carbon content is between 92.1% and 98%.

Carbon percent content and energy-

1 pound (lb) = 0.453 kilograms (kg).
lbs or lb is an abbreviation for pound. It is of Roman origin, and has descended from the word libra. Libra means balance.

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Which among the following types of coal produces the most heat per unit?a)Coalb)Lignitec)Anthracited)Pite)None of the above / More than one of the aboveCorrect answer is option 'C'. Can you explain this answer?

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