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

Options

A. `Ag_(3)N`
B. `Ag_(3)O`
C. `Ag_(2)S`
D. `Ag_(2)S` and ` Ag_(3)N`

Answer

C

Explanation

Silver article become black because silver reacts with `H_(2)S` gas present in air to term black coating of `Ag_(2)S`. The reaction is
`underset("Silver")(Ag)+underset("Hydrogen sulphide")(H_(2)O)to underset"(black)"underset("Silver sulphide")(Ag_(2)S)+H_(2)`