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1. Chemical Change (Irreversible)
2. Physical Change (Reversible)
3. Cooking of food is Irreversible because the properties of ingredients or substances changes which cannot be reversed.
4. breaking of bottle , Cutting of tree , melting of ice , grinding of wood into saw dust (extremely small particles) are the physical changes which cannot be reversed
5. Due to the exposure of the utensil in the presence of air/ moisture undergo a rxn resulting in the formation of copper compound which appears to be green in colour
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