Silver articles become black on prolonged exposure to air.

Question:

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

(a) AgCN

(b) Ag2O

(c) Ag2S

(d) Ag2S and AgCN

Solution:

(c). Air contains traces of hydrogen sulphide (H2S) gas which reacts with silver (Ag) to form Ag2S black in colour.

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