Which of the following are chemical changes?- Decaying of wood
- Burning of wood
- Sawing of wood
- Hammering of a nail into a piece of wood
(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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