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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2008

  • question_answer
        In the conversion of\[B{{r}_{2}}\]to\[BrO_{3}^{-},\]the oxidation number of Br changes from

    A)  zero to\[+5\]                   

    B)  \[+1\]to\[+5\]

    C)  zero to\[-3\]                    

    D)  \[+2\]to\[+5\]

    Correct Answer: A

    Solution :

                                    Bromine has zero oxidation state because it is in free state \[\overset{0}{\mathop{B}}\,{{r}_{2}}\xrightarrow[{}]{{}}BrO_{3}^{-}\] \[\overset{x}{\mathop{B}}\,O_{3}^{-\underline{2}}\]                 \[x+(-2\times 3)=-1\]                 \[x+(-6)=-1\]                 \[x=+6-1\]                 \[=+5\] So, oxidation number changes from 0 to\[+5\].


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