CBSE Class 10 Science 2019 · Paper 31/2/1 · Question 4(b)
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. Name the substances present in air with which these metals react and write the name of the products formed.
Answer
Silver reacts with sulphur in air to form black silver sulphide; copper reacts with moist carbon dioxide to form green basic copper carbonate.
Silver reacts with sulphur present in the air (as hydrogen sulphide, ) and forms a black coating of silver sulphide, .
Copper reacts with moist carbon dioxide in the air (carbon dioxide and water vapour, with oxygen) and forms a green coating of basic copper carbonate, .
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