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RAJASTHAN ­ PET Rajasthan PET Solved Paper-2001

  • question_answer
    The oxidation number of Cr in\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]is

    A)  6                

    B)  4

    C)  7                

    D)  3

    Correct Answer: A

    Solution :

     Let the oxidation number of Cr is\[x\]in\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}.\] \[2+(1)+2x+7(-2)=0\] \[2+2x-14=0\] \[2x-12=0\] \[2x=12\] \[x=+6\]


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