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  1. Copper substances when exposed to air gains a green coating due to the formation of:

    2. A.

     CuO
    B.

     CuCO3 Cu(OH)2
    C.

     CuSO4
    D.

     Cu(NO3)2

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    Answer : Option B

    Explanation :

    When copper is exposed to air, it reacts with moist carbon dioxide in the air and slowly loses its shiny brown surface and gains a green coat. This green substance is basic copper carbonate (CuCO3. Cu (OH)2). The formation of this green coating on the surface of a copper object corrodes it.

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