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During the manufacture of coke-oven gas, which of the following is obtained as a by-product?

(a) Volatile matter

(b) Metallurgical coke

(c) Ash content

(d) Gas

This question was posed to me by my college director while I was bunking the class.

This interesting question is from Gaseous Fuels in division Fuels and Combustion of Engineering Chemistry II

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Correct option is (d) Gas

The explanation: Coke-oven gas is made by heating coking coal in coke-ovens, in which metallurgical coke is obtained as the main product and gas is obtained as by-product. In the manufacture of coal gas, gas is obtained as main product.

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