A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance? (a) iron nail (b) glass (c) stone piece (d) wood

(d) wood

  • 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
  • Under the influence of heat, wood produces easily substances that react eagerly with oxygen, leading to the high propensity of wood to ignite and burn.

Article to refer

  1. Differentiate Between Combustible And Non Combustible Substance With Properties

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