Fuels and Combustion
The internal energy of the combustion products is __________ compared to that of reactants.

Equal
Less
More
More or less ; (depends on the state of fuel.)

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Fuels and Combustion
Lignite is

Can be used for gasification and steam generation
A coking coal
A high rank coal
A black banded coal which burns with a non-smoky yellowish flame

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

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
All of these
Controlling the dust nuisance while charging the coal

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