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Question

Fill in the following blanks with suitable words :

(a) A fuel must be heated to its___ before it starts burning.

(b) The most common supporter of combustion around us is___

(c) Fire produced by burning oil cannot be controlled by___

(d) A liquid fuel used in homes is___

(e) The amount of heat evolved when 1 kg of a fuel is burnt completely is called its___

(f) The substances which vaporise during burning, give___

(g) Burning of wood and coal causes___ of air.


Solution

a) ignition temperature

b) Air (oxygen)

c) Water

d) LPG

e) calorific value

f) flame

g) pollution


Chemistry
Science for Eighth Class
Standard VIII

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