Which of the following are chemical changes?(i) decaying of wood(ii) burning of wood(iii) sawing of wood(iv) hammering of a nail into 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 new substances are formed, that cannot be converted back into their original form.
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