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

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asked Feb 7, 2018 in Chemistry by sforrest072 (157,439 points) 60 409 933
Why do silver articles become black after sometime when exposed to air?

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answered Feb 7, 2018 by mdsamim (213,225 points) 5 10 15
selected Feb 7, 2018 by sforrest072
 
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Silver articles, when exposed to air containingn hydrogen sulphide, form silver sulphide layer on their surface. This layer is black in colour and the silver articles are said to be tarnished.

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