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

No excess air has been used for combustion

21% excess air has been used for combustion

21% excess oxygen has been used for combustion

Complete combustion of fuel has taken place

A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and th

1.	A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that___________________?
A.	21% excess air has been used for combustion
B.	21% excess oxygen has been used for combustion
C.	Complete combustion of fuel has taken place
D.	No excess air has been used for combustion
Answer» D. No excess air has been used for combustion