List conditions under which combustion can take place.
Burning of wood and coal causes __________ of air.
A liquid fuel, used in homes is __________
Fuel must be heated to its __________ before it starts burning.
Fire produced by oil cannot be controlled by ___________ .
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(i) Incomplete combustion of a fuel produces a poisonous gas called carbon monoxide and unburnt carbon particles which cause pollution.
(ii) Incomplete combustion of a fuel produces less heat and hence leads to the wastage of fuel.