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KVPY Sample Paper KVPY Stream-SX Model Paper-4

  • 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 :

    [a] \[C{{r}_{2}}O_{7}^{2-}+14{{H}^{+}}+6{{I}^{-}}\xrightarrow{{}}2C{{r}^{3}}+7{{H}_{2}}O+3{{I}_{2}}\] Since, \[C{{r}_{2}}O_{7}^{2-}\] is reduced to \[C{{r}^{3+}},\] thus final state of \[Cr\] is \[+3,\] which is formed by the reaction between KI and acidified potassium dichromate solution.     


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