Question

silver articles become black when kept in open for some time, whereas copper vessels lose their shiny brown surfaces and gain a green coat when kept in open

Answer 1

Answer:

Explanation: This is because when silver reacts with oxides of sulphur present in air it forms silver sulphide which forms a black coating on silver articles whereas copper reacts with carbon dioxide present in air to form green coloured coating of copper carbonate

Answer 2

Here is your answer user.