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10th Class Science Metals and Non-metals / धातु और अधातु

  • question_answer 47)
        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)                           (b)                          (c)                     (d)

    Answer:

                      (b) Copper reacts withpresent in air and forms a green coating on its surface due to the formation of basic copper carbonate [] as                


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