Fuels and Combustion
The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

CO, O₂, CO₂
O₂, CO₂, CO
CO₂, CO, O₂
CO₂, O₂, CO

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Fuels and Combustion
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

Is less liable to spontaneous combustion on storage
Requires smaller combustion space and less secondary air
None of these
Is more difficult to ignite and produces a shorter flame

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