Question

Lemon or tamarind is used for cleaning copper vessels turned greenish.

Hint:

Acidic substances like lemon and tamarind are commonly used to clean tarnished copper, as they react with copper oxide and dissolve the greenish coating.

Answer 1

Lemon or tamarind is acidic in nature and can effectively remove the greenish coating (copper carbonate) that forms on copper vessels due to oxidation. The acid helps in dissolving the copper salts and restoring the vessel's shine.