3. Fill in the blanks. a) Fuels release their energy through a chemical reaction known as_________ b) __________reaction is accompanied by the evolution of heat. c) The substances which________ easily on burning give flames. d) Changing of solids directly into vapour on heating is called ___________ e) Unburnt carbon particles form________ which appears as a dark powder. f) _________should never be used in case of an electrical fire.
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Answer:-
a) Combustion
b) Exothermic reaction
c) Inflammable
d) sublimation
e) Carbon monoxide
f) Petrol
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