Concept:A burning candle undergoes complete combustion because oxygen from the atmosphere is available in excess.
Explanation:Candle wax is a hydrocarbon, so burning it means the carbon and hydrogen combine with oxygen.
In sufficient air, complete combustion occurs.
Complete combustion of any hydrocarbon always produces water and carbon (IV) oxide.
This can be shown generally as:
Hydrocarbon+O2→CO2+H2O The carbon in the wax is fully oxidised to
CO2, not to carbon (II) oxide.
Carbon (II) oxide would only appear if oxygen were limited.
Sulphur oxides are impossible because candle wax does not contain sulphur.
Therefore, the end products are water and carbon (IV) oxide.
Answer:C. carbon (IV) oxide.