Question

Lemon or tarmarind is used to for cleaning copper vessels turned greenish. Give scientific reason.​

Answer 1

Answer:

Lemon and tamarind contain acid. The acid dissolves the green coating of basic copper carbonate present on the surface of a tarnished copper utensil and makes it shiny again

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Answer 2

Answer:

1. Copper reacts with the atmosphere to form copper carbonate, which is green in colour.
2. Copper carbonate being a base reacts with acids.
3. Lemon/tamarind contain citric acid/tartaric acid in them.
4. When lemon/tamarind is used to clean copper vessels, the greenish layer of copper carbonate on them gets removed.
5. Thus, lemon or tamarind is used to clean copper vessels that have turned greenish.