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JEE Main & Advanced Chemistry Redox Reactions / रेडॉक्स अभिक्रियाएँ Question Bank Oxidation number and Oxidation state

  • question_answer
    The oxidation state of \[Cr\] in \[C{{r}_{2}}O_{7}^{2-}\] is [BHU 2000; CPMT 2000]

    A) 4             

    B) - 6

    C) 6                                                    

    D) - 2

    Correct Answer: C

    Solution :

    \[\overset{*\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{r}_{2}}O_{7}^{2-}}}\,\]            \[2x-2\times 7=-2\];  \[2x=14-2=12\]                                 \[x=\frac{12}{2}=+6\].


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