Answer :

(i) Physical change

Beating of aluminium metal to make aluminium foil consist of a change in only shape and size.


(ii) Chemical change


Digestion of food involves various chemical reaction inside our stomach.


(iii) Physical change


Cutting off a log of wood into pieces just changes its physical properties like shape and size. Therefore, it is a physical change.


(iv) Chemical change


Crackers contains substances which are explosive and during burning explosive reaction took place. Hence, it is a chemical change.


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