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Q.

A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?

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a

Iron nail

b

Glass

c

Stone piece

d

Wood 

answer is D.

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Detailed Solution

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  • Wood reacts with oxygen, giving heat and fire.
  • Wood is a combustible substance as it will ignite, it will burn, support combustion or release flammable vapours when subjected to heat or fire. 
  • From all the above-mentioned, only wood is a combustible substance. It is burnt in different conditions to form coke and charcoal. Wood is used for both construction and fuel.
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