Multiple choice

Which one of the following gases is an end product of burning?

  1. Oxygen

  2. Carbon dioxide

  3. Vapours

  4. Argon

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon dioxide (CO2) is the primary end product of complete combustion. When fuel burns completely in the presence of oxygen, carbon in the fuel combines with oxygen to form CO2. Incomplete combustion produces carbon monoxide or soot instead. Oxygen is consumed during burning, not produced.