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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.

Sciences - Main Course Book

Chapter 2. Is Matter Around Us Pure



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The chemical changes amongst the above are:
growth of plant
rusting of iron
cooking of food
digestion of food
burning of a candle
The others are physical changes
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b,e and g are the options 
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