Question

Depending on the behaviour of the coal, when it is heated in the absence of air, it can be categorized into ______ categories.

(a) 2

(b) 3

(c) 4

(d) 5

This question was addressed to me by my school principal while I was bunking the class.

The origin of the question is Carbonization of Coal topic in portion Fuels and Combustion of Engineering Chemistry II

Answer 1

Correct option is (a) 2

To explain: Depending on the behaviour of the coal, when it is heated in the absence of air, it can be categorized into 2 categories, Coking and Non-coking coals.