1.lemon is used for restoring the shine of tarnished copper vessels.
2.a metal sulphide is converted into its oxide to extract metal from it.

Asked by manya.bhardwaj.01 | 28th Oct, 2017, 11:01: AM

Expert Answer:

1. Lemon contains citric acid. Tamarind contains tartaric acid. This acid neutralises the copper carbonate and dissolves the layer. The copper carbonate is formed as a result of its exposure t the moist carbon dioxide present in the air.
2. It is because the metals can be extracted easily when converted into its oxide.

Answered by  | 28th Oct, 2017, 10:49: PM

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