JEE Main & Advanced Chemistry The d-and f-Block Elements Question Bank Compounds of Transitional Elements

  • question_answer Which of the following statements is correct about equivalent weight of \[KMn{{O}_{4}}\] [MP PET 1994]

    A) It is one third of its molecular weight in alkaline medium

    B) It is one fifth of its molecular weight in alkaline medium

    C) It is equal to its molecular weight in acidic medium

    D) It is one third of its molecular weight in acidic medium

    Correct Answer: A

    Solution :

    It is one third of its molecular weight in alkaline medium because it gives 3 nascent oxygen in alkaline medium. \[2KMn{{O}_{4}}+{{H}_{2}}O\,\xrightarrow{+3{{e}^{-}}}\,2KOH+2Mn{{O}_{2}}+3[O]\] \ Equivalent weight = \[\frac{M}{3}\]

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