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Standard VIII
Chemistry
Types of Combustion
Question

Rapid combustion is:
  1. when gas burns, it produces heat and light.
  2. when there is evolution of heat.
  3. none of these.
  4. when material suddenly burst into flames.

A
when gas burns, it produces heat and light.
B
none of these.
C
when material suddenly burst into flames.
D
when there is evolution of heat.
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Solution
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Combustion in which a substance burns rapidly and produces heat and flame is known as rapid combustion. Example: combustion of LPG gas, petrol, etc. Substances which undergo rapid combustion have lower ignition temperature.

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