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CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2009

  • 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, ie, +4 state, so its further oxidation is not possible, it only undergoes reduction. Acidified\[KMn{{O}_{4}}\]is a strong oxidizing agent, but it cannot oxidize\[CO_{3}^{2-}\]. Hence, it will not be decolorized by\[CO_{3}^{2-}\].


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