Question

# ________ are substances which produce a large amount of energy when burnt.

Solution

## The substances which burn in air to produce large amounts of energy in the form of heat and light are known as fuels. Fuel + Oxygen (on heating)  → Energy + Carbon dioxide + Water vapour Coal, wood and oil are some common fuels. LPG and CNG are modern fuels which do not leave any residue on burning.Chemistry

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