Question

when Ag is exposed to air it gets black coating due to give chemical equation
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Answer 1

Answer:

Silver articles, when exposed to air become black after sometime. This is because the silver metal reacts with sulphur present in the atmosphere and forms silver sulphide. Thus, a layer of silver sulphide is formed on the surface of silver articles, because of which they appear dull and black.

Answer 2

When Ag is exposed to air,

it gets a black coating due to corrosion.

• Corrosion is the natural process of slow eating up of any metal when exposed to air(oxygen). It is an irreversible change.
• Silver(Ag) when exposed to air, reacts with the the oxygen and hydrogen present in the atmosphere and reacts with it to form hydrogen sulfide.
• The corrosion of silver is formed due to the collection of dust and the absorption of water.
• The chemical reaction for corrosion of silver is,

                      4Ag+3$H_{2}S$+$O_{2}$ → 2AgS+2$H_{2}O$

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