Question
Why are carbon and its compounds used as fuels for most applications?

Answer

When carbon is burnt in the presence of air or oxygen, it forms carbon dioxide and water with a release of a large amount of heat and light.
$C ( s )+ O _2(g) \longrightarrow CO _2(g)+$ Heat + Light
→ When carbon and its compounds are burnt, additional heat energy is not required for consistent burning.
→ Hence, carbon and its compounds are used as fuels for most applications.

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