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| 1. |
Black coating on silver |
| Answer» Silver article reacts with sulphur compounds such as H2S present in air. The phenomenon is called corrosion. For silver particularly, it is called tarnishing of silver.The black substance form in this reaction is silver sulphide (Ag2S).2 Ag(s) + H2S(g) → Ag2S(S) + H2(g) | |