Fuels and Combustion
A carbonaceous fuel (containing no H₂ or hydrocarbons) is burnt and the resulting flue gas contains 21% CO₂. It means that

21% excess air has been used for combustion
Complete combustion of fuel has taken place
21% excess oxygen has been used for combustion
No excess air has been used for combustion

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Fuels and Combustion
Orsat apparatus is meant for

Finding out combustion efficiency
Gravimetric analysis of flue gas
Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride
None of these

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