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NEET Sample Paper NEET Sample Test Paper-72

  • question_answer
    If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal, then the purification of metal may be carried out by:

    A) cupellation                    

    B) electrolytic refining

    C) zone refining                  

    D) poling

    Correct Answer: A

    Solution :

    Cupellation, Pb present in Ag is removed by cupellation. \[Pb+\frac{1}{2}{{O}_{2}}\,\xrightarrow{{}}PbO\,\,\uparrow \] Because Pb has more affinity for oxygen as compared to Ag.


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