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With increase in the time of carbonisation at a particular temperature (say 1000°C), the ______________ percentage in coke oven gas increases?

With increase in the time of carbonisation at a particular temperature (say 1000°C), the ______________ percentage in coke oven gas increases?

A. Hydrogen
B. Methane
C. Unsaturated hydrocarbons
D. All A., B. and C.