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Manipal Medical Manipal Medical Solved Paper-2014

  • question_answer
    The number of moles of \[KMn{{O}_{4}}\]that will be needed to react completely with one mole of ferrous oxalate in acidic solution is

    A) \[\frac{2}{5}\]                                      

    B) \[\frac{3}{5}\]

    C)  \[\frac{4}{5}\]                                     

    D) 1

    Correct Answer: B

    Solution :

    \[F{{e}^{2+}}\to F{{e}^{3+}}+{{e}^{-}}\] \[\begin{align}   & CO{{O}^{-}} \\  & | \\  & CO{{O}^{-}}\to 2C{{O}_{2}}+2{{e}^{-}} \\ \end{align}\] Ferrous oxalate on oxidation loses 3 electrons. Permanganate ion on reduction gains 5 electrons. Thus, 1 mole of ferrous oxalate will need 3/5 moles of \[KMn{{O}_{4}}\] for complete oxidation.


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