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__________ is the weight of residue obtained after burning a weighed amount of dry coal.

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__________ is the weight of residue obtained after burning a weighed amount of dry coal.

(a) Ash

(b) Volatile matter

(c) Moisture

(d) Carbon

The question was asked in a job interview.

The question is from Analysis of Coal topic in section Fuels and Combustion of Engineering Chemistry II

1 Answer

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Best answer
Right choice is (a) Ash

The explanation: Ash is an unwanted matter and non-combustible which is the residue left after all combustible substances are burnt off. %Ash= (weight of ash formed/weight of dry coal taken) × 100.

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