Question

Why copper and brass vessel are cleaned with lemon?​

Answer 1

Answer:

metals like copper and brass gathers a copper oxide layer on the upper surface. Lemon is considered to be very highly acidic in nature, as compared to copper. So the lemon juice cleans and gives the vessels dark colour.

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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.