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Question
Volumetric composition of flue gas analysed with the Orsat apparatus is : CO₂ = 12%, O₂ = 8%, CO = nil, N₂ = 80%. This flue gas composition indicates that
Options:
A .  Pure oxygen has been used for combustion
B .  Nitrogen percentage in the fuel is very high
C .  Excess air has been used for combustion
D .  Hydrogen is not present in the fuel
Answer: Option C

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