Carbon, in all its allotropic forms, burns in oxygen to give _________.

Correct option is B

Correct Answer: (B) Carbon dioxide

Explanation:

When carbon (in all its allotropic forms, such as graphite, diamond, or amorphous carbon) reacts with oxygen during combustion, the primary product is carbon dioxide (CO₂), provided there is sufficient oxygen present. The chemical reaction is:

C+O2→CO2

• If oxygen is limited, carbon monoxide (CO) can form, but under complete combustion, carbon dioxide is the sole product.

Key Points:

·         Allotropes of carbon include graphite, diamond, fullerene, and amorphous carbon.

·         Combustion of carbon in excess oxygen always produces CO₂.

·         Carbon monoxide (CO) is produced only in limited oxygen supply (incomplete combustion).

·         Neither carbonic acid (H₂CO₃) nor methane (CH₄) forms during the combustion of carbon.