Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2008

  • question_answer In an oxidation reduction reaction, dichromate \[(C{{r}_{2}}O_{7}^{2-})\] ion is reduced to \[C{{r}^{3+}}\] ion. The equivalent weight of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] in this reaction is

    A)  \[\frac{molecular\,weight}{3}\]

    B)  \[\frac{molecular\,weight}{6}\]

    C)  \[\frac{molecular\,weight}{1}\]

    D)  \[\frac{molecular\,weight}{2}\]

    Correct Answer: B

    Solution :

    \[{{K}_{2}}\overset{+6}{\mathop{C{{r}_{2}}}}\,{{O}_{7}}+4{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}{{K}_{2}}S{{O}_{4}}+\overset{+3}{\mathop{C{{r}_{2}}}}\,{{(S{{O}_{4}})}_{3}}\] \[+4{{H}_{2}}O+3[O]\] Equivalent weight \[=\frac{Molecular\text{ }weight}{\begin{align}   & Change\text{ }in\text{ }oxidation\text{ }number\text{ }of\text{ }atoms.~ \\  & present\text{ }in\text{ }one\text{ }molecule \\ \end{align}}\]\[\therefore \] Equivalent weight \[=\frac{Molecular\text{ }weight}{2\times 3}\]                                 \[=\frac{Molecular\text{ }weight}{6}\]

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