89. in which of the following sentences is or are correct? (a) Rusting is a chemical change because a new substance is formed
(b) Beating of Aluminium metal to make Aluminium foil, is a physical change
(c) Digestion of food is a chemical change (d) All the above
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Explanation:
(d) all the above
(a) because in rusting the red substance formed so it is a chemical change
(b) here it not ne reversible but composition is same as block of aluminium is made into a thin sheet is not possible
(c) as the food is giving energy to us new substance
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