Concept:Complete combustion of carbon in oxygen produces carbon dioxide.
Explanation:When carbon burns in a sufficient supply of oxygen, it undergoes complete combustion.
The chemical equation for this reaction is:
C+O2​→CO2​This reaction is exothermic, meaning it releases heat energy.
Carbon dioxide is a colorless and odourless gas at room temperature.
It is a greenhouse gas that contributes significantly to global warming.
Carbon monoxide (
CO) is formed only during incomplete combustion with limited oxygen, and it is highly toxic.
Carbonic acid (
H2​CO3​) is produced when carbon dioxide dissolves in water, not from direct burning.
Methane (
CH4​) is a hydrocarbon and the main component of natural gas, unrelated to this combustion process.
All allotropic forms of carbon—diamond, graphite, and fullerene—yield carbon dioxide when burnt in excess oxygen.
Answer:Option B: carbon dioxide.