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Why do silver articles become black afte...

Why do silver articles become black after some time ?

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Traces of hydrogen sulphide `(H_(2)S)` gas are present in air/atmosphere. It slowly reacts with silver to form silver sulphide `(Ag_(2)S)`, which is black. As a result, silver ornaments lose their shine after sometime.
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DINESH PUBLICATION-METALS AND NON-METALS-Very Short Answer Questions
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