Question

three form of coal and each function

Answer 1

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The process by which the coal is heated in 100 degree temperature in the absence of oxygen is called destructive distillation. Three forms of coal are -:
*coal gas.
*coal tar.
*coke.

among these three coke is the pure form of coal.

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Answer 2

There are 4 types of coal:-
a.Peat-Formation of peat is the first step in the formation of coal.It contains less than 60% of carbon and high proportion of water.Cannot obtain much heat.
b.Lignite-Peat is transformed into lignite because of increasing pressure and temperature inside the earth.60 to70% of carbon is present in it.It is 2nd step of coal formation.
c.Bituminous Coal-It is the 3rd step of coal formation.Contains 70 to 90% of carbon.
d.Anthracite-It is the pure form of coal.It is hard.Contains 95% of carbon.