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Manipal Medical Manipal Medical Solved Paper-2013

  • question_answer
    Pyrolusite in\[Mn{{O}_{2}}\]is used to prepare\[KMn{{O}_{4}}\]. Steps are \[Mn{{O}_{2}}\xrightarrow[{}]{I}MnO_{4}^{2-}\xrightarrow[{}]{II}MnO_{4}^{-}\] I and II are

    A)  fuse with KOH/air, electrolytic oxidation

    B)  fuse with KOH/air, electrolytic reduction

    C)  fuse with cone HN03/air, electrolytic reduction

    D)  All of the above

    Correct Answer: A

    Solution :

     \[Mn{{O}_{2}}+4KOH+{{O}_{2}}\xrightarrow[{}]{{}}2{{K}_{2}}Mn{{O}_{4}}+{{H}_{2}}O\]Step I \[MnO_{4}^{2-}\xrightarrow[{}]{Electrolytic\text{ }oxidation}MnO_{4}^{-}\] Step II


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