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JEE Main & Advanced Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank Mock Test - d- and f- Block Elements

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

    A) fused with KOH/air, electrolytic oxidation

    B) fuse with cone. HN03/air, electrolytic oxidation

    C) fused with KOH/air, electrolytic reduction

    D) All are correct

    Correct Answer: A

    Solution :

    [a] \[2Mn{{O}_{2}}\xrightarrow[Oxidation\,with\,air]{Fused\,with\,KOH}MnO_{4}^{2-}\] and \[MnO_{4}^{2-}\xrightarrow[in\,alkaline\,solution]{Electrolytic\,oxidation}MnO_{4}^{-}\]


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