Silver ornaments turn black over time when the silver reacts with hydrogen sulphide in air and forms a layer of silver sulphide on the ornaments. How is this an example of redox reaction? Explain using an equation.
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Silver becomes black because of hydrogen sulfide (sulfur), a substance that occurs in the air. When silver comes into contact with it, a chemical reaction takes place & a black layer is formed..:..oxidation of silver jewelry is a sign that it is really silver.Silver metal is highly unreactive,it does not react with oxygen. But with prolonged exposure to air, it reacts with hydrogen sulphide gas (H²S).
Silver articles form a coating of silver sulphide (Ag²S) & Gets tanished
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Silver article turns black when kept in the air because silver article reacts with sulphur compounds such as hydrogen sulphide (H2S) present in air. The phenomenon is called corrosion.
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