Answer:
(a) Options (i) Decaying of wood and (ii) Burning
of wood are chemical changes, because in these processes, the chemical
composition of wood is changed and new substances are formed, which cannot be
converted back into their original form.
In (iii) Sawing of wood and (iv) Hammering of a nail into
a piece of wood, chemical composition of wood is not changed, therefore, (iii)
and (iv) are physical changes
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