Question

Write the chemical name of the coating that forms on silver and copper articles when these are left exposed to moist air

Answer 1

the metals react with oxygen

the chemical names are

1) Ag2O

2)CuO

Answer 2

Silver Sulphide and Copper Carbonate are the coatings formed on Silver and Copper articles respectively.

Explanation:

• The coating which forms on the silver article is generally blackish in colour.

• Its name is Silver Sulphide and its formula is given by $Ag_2S.$.

• It can also be somewhat green in colour which is formed by the coating of Silver Oxide.

• Similarly, the copper articles also turn green when exposed to a certain level of moisture which is due to the presence of Copper Carbonate.

• The mixture of copper carbonate chemical formula is given by $CuCo_3.$. It acquires a colour which is usually dull green.

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