Answer:
a. The amount of heat energy produced on completely burning of 1 kg of fuel is called the calorific value
b. The combustion in which no external heat is given is known as spontaneous combustion.
c. Hydrogen being a highly inflammable gas and oxygen being a supporter of combustion.
d. Fuel must be heated to its ignition temperature before it starts burning.
e. Fire produced by oil cannot be controlled by water
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