Fuels and Combustion
Higher percentage of ash in coal meant for the production of metallurgical grade coke

None of these
Decreases the abrasion resistance of coke
Causes brittleness in steel
Decreases the hardness of coke

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Fuels and Combustion
Sometimes water is sprayed during coal charging in the coke oven, which helps in

All of these
Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H₂ in the gas (due to the endothermic reaction represented by C + H₂O = CO + H₂)
Prevention of clinker formation in the oven
Controlling the dust nuisance while charging the coal

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