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NEET Chemistry NEET PYQ-The d-and f-Block Elements

  • question_answer
    The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is:       [AIPMT (S) 2005]

    A) one fifth

    B) five

    C) one

    D) two

    Correct Answer: D

    Solution :

    [d] In alkaline solution, \[KMn{{O}_{4}}\,\]is reduced to \[Mn{{O}_{2}}\,\](colorless).
                \[\frac{\begin{align}   & 2KMn{{O}_{4}}+2{{H}_{2}}O\xrightarrow[{}]{{}}2Mn{{O}_{2}}+2KOH+3\,[O] \\  & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,KI\,+3\,[O]\,\xrightarrow[{}]{{}}KI{{O}_{3}} \\ \end{align}}{2KMn{{O}_{4}}+2{{H}_{2}}O+KI\xrightarrow[{}]{{}}2Mn{{O}_{2}}+2KOH+KI{{O}_{3}}}\]
                Hence, two moles of KMnO4 are reduced by one mole of KI.


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