1.

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.

Answer»

(i) and (II)
(ii) and (iv)
(iii) and (iv)
(i), (ii) (iii).

Solution :All the THREE are chemical changes.


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