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Silver articles become black when kept i...

Silver articles become black when kept in open for some time, whereas copper vessels lose their shiny brown surfaces and gain a green coat when kept in open. Name the substances present in air with which these metals react and write the name of the products formed.

Text Solution

Verified by Experts

Silver : Sulphur in air, Product : silver sulphide
Copper : Moisture & Carbon dioxide, Product :
Copper carbonate
Detailed Answer : Silver articles when exposed to air turn black as it reacts with sulphur in the air to form a coating of silver sulphide.
`underset("Silver sulphide")(2Ag + H_(2)S rarr Ag_(2)S + H_(2))`
Copper vessels lose their shiny brown surface as copper reacts with moist carbon dioxide in the air and forms a green layer of copper carbonate and copper hydroxide.
`2Cu + H_(2)O + CO_(2) + O_(2) rarr underset("hydroxide") underset("Copper")(Cu(OH)_(2)) + underset("Carbonate")underset("Copper")(CuCO_(3))`
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Knowledge Check

  • Silver articles become black after some time when exposed to air . This is because of …………coating .

    A
    Silver sulphate
    B
    silver oxide
    C
    silver sulphide
    D
    silver sulphite

  • If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of

    A
    `CuSO_(4)`
    B
    `CuCO_(3)`
    C
    `Cu(NO_(3))_(2)`
    D
    CuO

  • Silver article turns black when kept in the open for a few days due to formation of ________.

    A
    AgS
    B
    `H_(4) S`
    C
    `AgSO_(4)`
    D
    `Ag_(2)S`

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