What is the unburnt material that is present in a fuel, e.g. wood?

Ash

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Coal

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Coke

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Carbon

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Solution

The correct option is A Ash
Ash is the solid residue of a fuel. It is the material that is left unburnt at the end of combustion. Its chemical composition does not contain carbon.

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What are the disadvantages of burning wood as fuel

Incomplete combustion of coal and wood releases unburnt carbon particles.

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