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Q.

Which of the following are chemical changes?

(i) Decaying of wood                (ii) Burning of wood

(iii) Sawing of wood                  (iv) Hammering of a nail into a piece of wood

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a

(i) and (ii)

b

(ii) and (iii)

c

(iii) and (iv)

d

(i) and (iv)

answer is A.

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Detailed Solution

Decaying of wood  and burning of wood  are chemical changes as the chemical composition of wood changes and new substances are formed. 

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