Fuels and Combustion
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

Higher calorific value
Neither A nor B
Lower hydrogen content
Both A & B

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Fuels and Combustion
Washing of coal

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

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