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Why the surface of silver metal gets tar...

Why the surface of silver metal gets tarnished on exposure to air?

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The surface of silver metal gets tarnished (i.e. loses lustre and becomes dull) on exposure to air. This is due to the formation of a coating of black silver sulphide (`Ag_2S`) on its surface by the action of `H_2S` gas present in the air.
`underset("Silver")(2 Ag(s)) + underset("sulphide")underset("Hydrogen")(H_2S(g)) rarr underset("sulphide")underset("Silver")underset("Black")(Ag_2S(s)) + underset("Hydrogen gas")(H_2(g))`
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Knowledge Check

  • The substance that gets adsorbed on the surface of the solid is called

    A
    adsorbate
    B
    adsorbent
    C
    micelle
    D
    inner phase

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