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.
(a) (i) and (ii)
(b) (ii) and (iv)
(c) (iii) and (iv)
(d) (i), (ii) (iiii).
Solution:
(d) All the three are chemical changes.