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Which of the following are chemical changes ?
(i) Decaying of wood
(ii) Burning of wood
(iii) Growth of wood in a tree
(iv) Hammering of a nail on a piece of wood.
A. (i) and (ii)
B. (ii) and (iv)
C. (iii) and (iv)
D. (i), (ii) (iii).

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Correct Answer - D
All the three are chemical changes.

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