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Which of the following are chemical chan...

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

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(a) Growth of a plant (b) rusting of iron, (d) cooking of food (e) digestion of food and (g) burning of a candle, are chemical changes.
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