Which of the following are chemical changes?

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.

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