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J & K CET Engineering J and K - CET Engineering Solved Paper-2011

  • question_answer
    In a volumetric experiment, it was found that a  solution of\[\text{KMn}{{\text{O}}_{\text{4}}}\]is reduced to\[\text{MnS}{{\text{O}}_{\text{4}}}\text{.}\]If the normality of the solution is 1.0 N, then the molarity of the solution will be

    A)  0.5 M          

    B)  0.2 M

    C)  1.0 M          

    D)  0.4 M

    Correct Answer: B

    Solution :

     \[2K\overset{+7}{\mathop{M}}\,n{{O}_{4}}+3{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}{{K}_{2}}S{{O}_{4}}+2\overset{+2}{\mathop{M}}\,nS{{O}_{4}}\] \[+\,3{{H}_{2}}O+5O\] \[\because \]Normality of the solution \[=1.0\text{ }N\] .'. Molarity of the solution\[=\frac{\text{Normality}}{\text{Change}\,\text{in}\,\text{ON}}\] \[=\frac{1.0}{5}=0.2\,M\]


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