When silver is exposed to air, mention teh chemical reaction which takes place
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al2co2 - al3o2. @. l
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Silver articles become black on exposure to air for sometime. When silver articles exposed to air silver racts with sulphur present in the atmosphere and form a black layer of silver sulphide on the surface. Copper articles get tarnished by reacting with air and water. Due to this, a layer is formed over copper vessels. This layer mainly contains black copper oxide and green copper hydroxide.
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