A silver article turn black when kept in open for few days. The article rubbed with toothpaste again
starts shining.
a. Why do silver article turn black when kept in open for a few days? Name the phenomenon involved.
b. Name the black substance formed and gives its chemical formula.
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Silver corrodes slowly due to the presence of H2S gas in the air . Silver first gets oxidised to silver oxide (Ag2O) . Ag2O is of black colour . Again it reacts with H2S to form silver sulphide (Ag2S) which is again black
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