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JIPMER Jipmer Medical Solved Paper-2009

  • question_answer
    In an oxidation-reduction, reaction, \[MnO_{4}^{-}\] ion is converted to \[M{{n}^{2+}}.\] What is the number of equivalents of \[KMn{{O}_{4}}\] (mol. wt. = 158) present in 250 mL of 0.04 M \[KMn{{O}_{4}}\]solution?

    A)  0.02      

    B)                         0.05                      

    C)  0.04                      

    D)         0.07

    Correct Answer: B

    Solution :

    Change in oxidation number\[=(+7)-(+2)=5\] \[\therefore \] Normality of solution\[=5\times 0.04=0.20\text{ }N\] Volume = 250 mL \[\therefore \] Number of equivalents of\[KMn{{O}_{4}}\] \[=0.20\times \frac{250}{1000}=0.05\]


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