Fuels and Combustion
With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.

Hydrogen
Unsaturated hydrocarbons
All of these
Methane

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Fuels and Combustion
Washing of coal

Improves its coking properties
Controls its ash fusibility and increases its calorific value
All of these
Reduces its sulphur and ash content

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