A silver article turns black when kept open. The article shines when rubbed with toothpaste. (a)Why does the article turn black? (b)Name the phenomenon. (c)Name the black substance(d)Name the type of reaction.
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Explanation:
a. because of reaction with sulphur particles in air.
b. it is corrosion
c. the black substance AgS(silver sulphide)
d. its a combination reaction.
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