Question

Copper and brass vessel are cleaned with lemon short answer

Answer 1

1.Copper undergoes oxidation in air to form black copper oxides. Copper oxid react slowly with carbon dioxide in air and gains a green coat. Thus green substance is copper carbonate.

2. Lemon contains acid. The acid dissolves the green coating of basic Copper carbonate present on the surface of a tarnished copper and brass vessels and make them shiny again

Answer 2

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Ans: The citric acid present in the lemon or tamarind neutralises the basis copper carbonate and dissolves the layer. That is why, tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its characteristic lustre.