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                                    Lemon or tamarind is used for cleaning copper vessels turned greenish. | 
                            
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Answer» SOLUTION :(1) Copper undergoes oxidation in air to form black copper oxide. Copper oxide reacts SLOWLY with carbon DIOXIDE in air and gains a green COAT. This green substance is copper carbonate.  (2) Lemon and tamarind contain acid. The acid dissolves the green coating of basic copper carbonate present on the surface of a tarnished copper utensil and makes it shiny again.  | 
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