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BCECE Engineering BCECE Engineering Solved Paper-2008

  • question_answer
    The number of moles of \[\text{KMn}{{\text{O}}_{\text{4}}}\]reduced by one mole of KI in alkaline medium is

    A) 1            

    B) 5

    C) 1/2                        

    D)                        1/5

    Correct Answer: A

    Solution :

                    In alkaline medium \[K\overset{+7}{\mathop{M}}\,n{{O}_{4}}+O{{H}^{-}}\xrightarrow{{}}{{K}_{2}}\overset{+6}{\mathop{M}}\,n{{O}_{4}}\] Change in oxidation number                                 \[=7-6\]                                                \[=1\] Hence, moles of KI = moles of\[KMn{{O}_{4}}.\]


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