Question

lemon and tamarind is used for cleaning copper vessels turned greenish. (scientific reason) ​

Answer 1

Answer:

Copper oxide reacts slowly with carbon dioxide in air and gains a green coat. This green substance iscopper carbonate. (2) Lemon and tamarind contain acid. The acid dissolves the green coating of basiccopper carbonate present on the surface of a tarnished copper utensil and makes it shiny again.

Answer 2

Answer:

1. Copper vessels turned greenish due to the formation of copper carbonate layer.
2. The citric acid present in the lemon or tamarind neutralizes the basic copper carbonate and dissolves the layer.
3. That is why tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its characteristic lustre.

Explanation:

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