Why silver articles become black after sometime when exposed to air?

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Solution

Air contains traces of hydrogen sulphide (H₂S) gas. Silver has a tendency to combine with H₂S to form silver sulphide (Ag₂S) which is black in colour. On account of this, silver articles become black after some time when kept exposed to air.

$2 A g (s)$ + $H_{2} S (g)$ $\to$ ${A g}_{2} S (s)$ + $H_{2} (g)$

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