Question

What are the constituents of coal gas ?

Answer 1

Coal gas is gaseous mixture—mainly of  hydrogen, methane, and carbon monoxide—formed by the destructive distillation (i.e., heating in the absence of air) of bituminous coal .
I.e constituents are: CO,CH4,H2....

Answer 2

COAL GAS CONTAINS A MIXTURE OF CALORIFIC GASES INCLUDING HYDROGEN, CARBON MONOXIDE, METHANE, ETHYLENE AND VOLATILE HYDROCARBONS TOGETHER WITH SMALL QUANTITIES OF NON-CALORIFIC GASES SUCH AS CARBON DIOXIDE AND NITROGEN.

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