Question

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 into a piece of wood.
(1) (i) & (ii)
2) (ii) & (iv)
(3) (iii) & (iv)
(4) (i), (ii) & (iii)

Answer 1

burning of wood ,decaying of wood and growth of plant into a tree. i.e 1 , 2 and 3

Answer 2

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The following are chemical change

(i) Decaying of wood

(ii) Burning of wood