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CMC Medical CMC-Medical VELLORE Solved Paper-2011

  • question_answer
    To an aqueous solution containing anions, a few drops of acidified \[KMn{{O}_{4}}\] are added. Which one of the following anions, if present will not decolourise the \[KMn{{O}_{4}}\] solution?

    A)  \[{{I}^{-}}\]                                       

    B)  \[CO_{3}^{2-}\]

    C)  \[{{S}^{2-}}\]                                    

    D)  \[NO_{2}^{-}\]

    E)  \[C{{l}^{-}}\]

    Correct Answer: B

    Solution :

                                    In \[CO_{3}^{2-},\]\[C\]is present in its highest oxidation state, i.e., +4 state, so its further oxidation is not possible, it only undergoes reduction. Acidified \[KMn{{O}_{4}}\] is a strong oxidising agent, but it cannot oxidise \[CO_{3}^{2-}\]. Hence, it will not be decolourised by\[CO_{3}^{2-}\].


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