Question

Silver articles become black on prolonged exposure to air. This is due to the formation of

Options

• Ag₃N

• Ag₂O

• Ag₂S

•  Ag₂S and Ag₃N

Answer 1

Ag₂S

Explanation - 

Silver objects corrode slowly in the air due to the presence of hydrogen sulphide which reacts with silver articles to form a black coloured chemical compound silver sulphide.

`4"Ag"("s") + 2"H"_2"S"("g") + "O"_2("g") -> 2"Ag"_2"S"("s") + 2"H"_2"O"("l")`