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You might have seen lemon or tamarind juice being used to clean tarnished surface of copper vessels.

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You might have seen lemon or tamarind juice being used to clean tarnished surface of copper vessels. Explain why these sour substances are effective in cleaning the vessels ?

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Lemon juice contains citric acid and tamarind contains tartaric acid. These acids react with a basic layer of copper carbonate on the surface to form soluble salts which are easily removed and surface shines.

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