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Standard VIII
Chemistry
Question

A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?
  1. Iron nail
  2. Glass
  3. Stone piece
  4. Wood

A
Stone piece
B
Glass
C
Iron nail
D
Wood
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Solution
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Combustible substances are the substance which burn in air to produce heat and light are called combustible substances. Eg :- wood, coal, charcoal, kerosene, petrol, diesel, liquified petroleum gas (LPG), compressed natural gas (CNG) etc.
Substances like stone, glass, iron nails, etc. do not burn on being exposed to flame. Such substances are called non-combustible substances.

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