Which of the following are chemical changes?
  1. Decaying of wood
  2. Burning of wood
  3. Sawing of wood
  4. Hammering of a nail into a piece of wood

  5. (a) (i) and (ii)
    (b) (ii) and (iii)
    (c) (iii) and (iv)
    (d) (i) and (iv)


Correct answer: (a) (i) and (ii)  

Explanation: Decaying and burning of wood are chemical changes as in these processes, the chemical composition of wood is changed and a new substance is formed, that cannot be converted back into its original form.

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Updated on: 19-Jan-2023

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