Fuels and Combustion
In flue gas analysis by Orsat's apparatus, carbon monoxide is absorbed by

Potassium hydroxide
Alkaline pyrogallol solution
None of these
Cuprous chloride

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Fuels and Combustion
Pick out the wrong statement.

Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing
Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel
Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal
None of these

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