Which of the following

Which of the following are chemical changes ?
(a) Growth of a plant
(b) Rusting of iron
(c) Mixing of iron fillings and sand
(d) Cooking of food
(e) Digestion of food
(f) Freezing of water
(g) Burning of a candle

Rusting of iron, cooking of food, digestion of food, and burning of candle are chemical changes.

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