Question

When silver is corroded then it changes into black colour due to the formation of

Answer 1

Answer:

Ag2S

Explanation:

Answer 2

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It is so due formation of Ag2S.

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Silver object tarnish slowly in air(i.e. polished silver articles gradually blacken).this is due to traces of H2S in air which react with Ag,forming black Ag2S.

Chemical equation will be: 2Ag + O2→Ag2O

Reversing process:

Ag2O + H2S→Ag2S + H2O

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