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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

An electric spark is struck between two electrodes placed near each other in a closed tank full of petrol. Will the petrol catch fire ? Explain your answer.

No, the petrol will not catch fire. This is because in a closed tank full of petrol, there is no air to support the combustion of petrol. In the absence of supporter of combustion, petrol cannot burn or catch fire.

List conditions under which combustion can take place.

Conditions necessary for combustion are :

(i) Presence of combustible substance.

(ii) Attainment of ignition temperature.

(iii) Proper supply of air to provide oxygen.

Burning of wood and coal causes __________ of air.

pollution

Fuel must be heated to its __________ before it starts burning.

ignition temperature

Fire produced by oil cannot be controlled by ___________ .

water

A liquid fuel, used in homes is __________

kerosene

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