Fuels and Combustion
Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in

Ammoniacal cuprous chloride
None of these
Pyrogallol solution
KOH

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

Prevention of clinker formation in the oven
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)
Controlling the dust nuisance while charging the coal

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Fuels and Combustion
Cannel coal

Is non-coking
Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named
Has a high volatile matter content and burns with a luminous smoky flame
All of these

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