Fuels and Combustion
With increase in the temperature of carbonisation of coal

All of these
Methane content in the coke oven gas decreases and carbon monoxide content increases
Hydrogen content of coke oven gas increases due to cracking of hydrocarbons
Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content

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Fuels and Combustion
The weathering index of a coal

Is related to its calorific value
Gives an idea of the fusion temperature of ash
Is a measure of its caking tendency
Is a measure of its size stability, when stored & exposed to weather

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