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AIIMS AIIMS Solved Paper-2011

  • question_answer
    The oxidation state of chromium in the final product formed by the reaction between \[KI\] and acidified potassium dichromate solution is

    A)  \[+3\]                  

    B)         \[+2\]                  

    C)  \[+6\]                  

    D)         \[+4\]

    Correct Answer: A

    Solution :

    \[C{{r}_{2}}O_{7}^{2-}+14{{H}^{+}}+6{{I}^{-}}\to 2C{{r}^{3+}}+7{{H}_{2}}O+3{{I}_{2}}\] \[C{{r}_{2}}O_{7}^{2-}\]  is reduced to \[C{{r}^{3+}}\]. Thus, final state of Cr is +3.


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