Question

Copper and brass vessels are cleaned with lemon ​

Answer 1

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Here is your answer

This is because lemon contains citric acid to clean the impurities in copper and brass

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Answer 2

Answer:

Citric acid in lemon juice etches away copper oxide that gives the vessels the dark color. When the oxide is removed, the copper metal underneath is exposed, it has a common ph range of 2-3 and reacts with metals and serves as a good cleaning fluid for metallic surfaces