rub a piece of lemon over the copper for a minute and wash it with normal water after that.Is the change chemical or physical?Explain with reason
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Answer:
It's a chemical reaction
Explanation:
The lemon juice contains citric acid. Its layer slowly gets deposited on the surface of the metal. Now as lemon is acidic, hence when we rub the tarnished copper vessel with lemon, the basic copper oxide or copper carbonate reacts with the acid present in lemon to form a salt which is washed away with water.
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