Question

A dull or tarnished copper vessel begins to shine again when rubbed with lemon. Explain.

Answer 1

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___Here's your Answer _______

When Copper vessel is left in the atmosphere, it reacts with oxygen present in the atmosphere and forms copper oxide, which gives a dull appearance. It is alkaline in nature so when rubbed with lemon. The acid present in the lemon neutralizes the effect of base. And it begins to shine again.
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Answer 2

Hi..✌✌
Here's ur answer...
✔✔Lemon is acidic. Thus, on rubbing the tarnished copper vessel with lemon, the basic copper oxide or copper carbonate reacts with the acid (citric acid) present in the lemon to form a salt which is washed away with water... ✔✔

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