Question

give reason A tarnished copper vessel begins to shine again when rubbed with lemon​

Answer 1

Hey dude here is ur desired answer

when copper vessels are kept in open they react with oxygen to form copper oxide and copper oxide reacts with carbon further to form copper carbonate . copper carbonate forms a green layer on vessels that is poisonous. so lemon or vinegar or scrubber is applied on vessels and the layer is removed .

hope this must clear ur doubt any doubt u can ask me in comments.

pls mark as brainleist as I have worked har to write it

wishes-vinay :-)