For a combustion reaction to occur, there must be presence of O2 and a spark, for ignition, producing mainly CO2, H2O and a great amount of heat being released.
From the options,
- A bonfire consists on the burning of organic fuel generating fire and products of this combustion.
- A car engine works burning fossil fuels generating power from the explosion, besides the products previously stated.
- Battery acid burning the floor does not correspond to a combustion reaction, it is only the way the acid is corrosive.
- A rocket liftinf off consists on the burning of a great amount of fuel to generate enough power for the action, producing the products previously mentioned.
Thus, the correct answer that is NOT an example of combustion occurring is:
C. Battery acid burning the floor.