Copper oxide reacts slowly with carbon dioxide in air and gains a green coat. This green substance iscopper carbonate. (2) Lemon and tamarind contain acid. The acid dissolves the green coating of basiccopper carbonate present on the surface of a tarnished copper utensil and makes it shiny again.
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Answer:
Copper oxide reacts slowly with carbon dioxide in air and gains a green coat. This green substance iscopper carbonate. (2) Lemon and tamarind contain acid. The acid dissolves the green coating of basiccopper carbonate present on the surface of a tarnished copper utensil and makes it shiny again.