IGCSE Chemistry 0620/21/O/N/21 Q34


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34 Fuel X produces carbon dioxide and water when it is burned in air. So does fuel Y.

What could X and Y be?

X            Y
A     C           H2
B     C         C8H18
C    CH4       H2
D    CH4    C8H18

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Answer ( 1 )


    For a substance to produce carbon dioxide and water by combustion in air, the substance must contain carbon and hydrogen atoms.

    CH4 + 2O2 –> CO2 + 2H2O

    2C8H18 + 25O2 –> 16CO2 + 18H2O

    Ans: D

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