JEE Main & Advanced Sample Paper JEE Main Sample Paper-3

  • question_answer
    Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are, respectively

    A)  \[MnO_{4}^{2-},M{{n}^{3+}}\]and\[M{{n}^{2+}}\]

    B)  \[Mn{{O}_{2}},Mn{{O}_{2}}\]and\[M{{n}^{2+}}\]

    C)  \[Mn{{O}_{2}},Mn{{O}_{2}}^{+}\]and\[M{{n}^{3+}}\]

    D)  \[MnO,Mn{{O}_{2}}\]and\[M{{n}^{2+}}\]

    Correct Answer: B

    Solution :

     In neutral and alkaline medium \[MnO_{4}^{-}+2{{H}_{2}}O+3{{e}^{-}}\xrightarrow[{}]{{}}Mn{{O}_{2}}+4O{{H}^{-}}\] In acidic medium: \[MnO_{4}^{-}+8{{H}^{+}}+5{{e}^{-}}\xrightarrow[{}]{{}}M{{n}^{2+}}+4{{H}_{2}}O\]


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