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EAMCET Medical EAMCET Medical Solved Paper-2005

  • question_answer
    In an oxidation-reduction reaction, \[\text{MnO}_{4}^{-}\] ion is converted to \[\text{M}{{\text{n}}^{\text{2+}}}.\] What is the number of equivalents of \[\text{KMn}{{\text{O}}_{\text{4}}}\] (mol. wt. = 158) present in \[\text{250 mL }\]of \[\text{ 0}\text{.04 M KMn}{{\text{O}}_{\text{4}}}\]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 \[\text{= 5  }\!\!\times\!\!\text{  0}\text{.04 = 0}\text{.20}\,\text{N}\] Volume = 250 mL \[\therefore \] Number of equivalents of \[\text{KMn}{{\text{O}}_{\text{4}}}\] \[=0.20\times \frac{250}{1000}\] \[=0.05\]


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