Name a greyish coating formed on silver in presence of air
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Silver hydroxide or oxide . That is black in colour
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Noble metals like silver corrode in presence of chemical compounds like Hydrogen Sulphide. This process is called tarnishing . It appears as a dull, gray or black film/coating over metal. the layer of tarnish seals and protects the underlying layers from reacting. Silver tarnish is comprised of Ag2O .
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