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what is fuel ?
Any combustible substance which on burning in presence of oxyzen produce large amount of heat  that can be used for domestic and industrial purposes is called fuel.
Example:-wood,charcoal, coal, kerosene etc.
During cumbustion of fuels, a chemical reaction involving breakdown of bond of reactants and formation of new bond in the products and this results in large amount of heat release, therefore they are called as chamical fuel.
               I.            Solid fuel(wood)

            II.            Liquide fuel( crude oil)
          III.            GAS(natural gas)

       I.            Solid(coke)
     II.            Liquide(LPG)
  III.            Gas(water gas)

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