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NEET Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank Self Evaluation Test - The d-and f-Block Elements

  • question_answer
    If \[KMn{{O}_{4}}\] is reduced by oxalic acid in an acidic medium then oxidation number of Mn changes from

    A) 4 to 2                           

    B) 6 to 4

    C) +7 to+2          

    D) 7 to 4

    Correct Answer: C

    Solution :

    [c] In acid medium \[MnO_{4}^{-}+8{{H}^{+}}+5{{e}^{-}}\to M{{n}^{2+}}+4{{H}_{2}}O\] (O.S. of Mn changes form +7 to +2).


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