Question

How does the texture of coal changes with its maturity?

(a) Becomes hard, less brittle and moderately tough

(b) Becomes hard, more brittle and more tough

(c) Becomes hard, more brittle and less tough

(d) No change

The question was posed to me in semester exam.

The query is from Characteristics of Coal in division Fuels and Combustion of Engineering Chemistry II

Answer 1

The correct choice is (b) Becomes hard, more brittle and more tough

For explanation: The texture of coal tends to the layer present on the coal and its maturity is from lignite to anthracite. The number of layers from lignite to anthracite increases due to which the compactness increase, thus increasing its toughness, hardness and brittleness.