Question

3. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Why
are these sour substances effective in cleaning the vessels? Explain.
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Answer 1

Heydude your answer is

In tarnished copper vessel there is layer formed due to corrosion which is basic in nature which is dissolved in the lemon or tamarind juice which are acidic in nature. Thus the vessel get thoroughly cleaned

Hope it's help

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Answer 2

Copper when exposed to the open air, reacts with the carbon dioxide, moisture and oxygen in the atmosphere to form a layer of basic copper carbonate on the surface of copper vessel.

since, this layer is basic in nature therefore when rubbed with any mild acid like lemon juice or tamarind,,the neutrallisation reaction take place which remove the basic layer formed on copper vessel