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Standard VIII
Chemistry
Question

The difference between combustible over non-combustible substances is:
  1. it cannot ignite
  2. it can ignite
  3. need high activation energy
  4. need low activation energy

A
it cannot ignite
B
it can ignite
C
need low activation energy
D
need high activation energy
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Solution
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Combustible substances:- Substances which burn in air to produce heat and light are called combustible substances. Eg:- wood, coal, charcoal, kerosene, petrol, diesel, liquefied petroleum gas (LPG), compressed natural gas (CNG) etc.

Non-Combustible substances:- Substances like stone, glass, iron nails, etc. do not burn on being exposed to flame.

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