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When copper is exposed to atmosphere for...

When copper is exposed to atmosphere for a longer time, a green mass deposits on its surface. Discuss the chemical reaction involved.

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Moist air containing some `CO_2` attacks metal slowly forming a green basic carbonate as:
`2Cu+CO_2+O_2+H_2OtoCu(OH)_2CuCO_3`
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Knowledge Check

  • When brass is exposed to air for a long period of time it turns to green due to the

    A
    formation of `Cu(OH)_(2)`
    B
    formation of `CuSO_(4)`
    C
    formation of `CuCO_(3)`
    D
    formation of `Cu_(2)O`

  • When copper is placed in the atmosphere for sufficient time, a green crust is formed on its surface. The composition of the green crust is:

    A
    `CU(OH)_(2)`
    B
    `CuO`
    C
    `CuCO_(3)`
    D
    `CuCO_(3).Cu(OH)_(2)`

  • When a copper vessel is exposed to moist air for a long time, it acquires a dull green coating on its surface. The material of this green coating is a mixture of:

    A
    Copper oxide and copper sulphate
    B
    Copper carbonate and copper hydroxide
    C
    Copper oxide and copper carbonate
    D
    Copper hydroxide and copper sulphate

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