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JEE Main & Advanced AIEEE Solved Paper-2005

  • question_answer
    The oxidation state of chromium in the final product formed by the reaction between \[KI\] and acidified potassium dichromate solution is     AIEEE  Solved  Paper-2005

    A) +3                          

    B)        +2                          

    C)        +6                          

    D)        +4

    Correct Answer: A

    Solution :

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


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