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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

The type of combustion in which any substance starts to burn of its own is called __________.

spontaneous

Fire produced by oil cannot be controlled by ___________ .

water

Burning of wood and coal causes __________ of air.

pollution

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

ignition temperature

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.

A liquid fuel, used in homes is __________

kerosene

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