Q4 / 180 · COMEDK 2018 · Chemistry

In the conversion of $\mathrm{Br}_{2}$ to $\mathrm{BrO}_{3}^{-}$, the oxidation number of Br changes from

  • Correct answer
    A
    zero to $+5$
  • B
    $+1$ to $+5$
  • C
    zero to $-3$
  • D
    $+2$ to $+5$

Solution

The oxidation number of $\mathrm{Br}$ in $\mathrm{Br}_{2}$ is zero. The oxidation number of $\mathrm{Br}$ is $\mathrm{BrO}_{3}^{-}$ $$ \begin{aligned} x+3 \times(-2) &=-1 \\ x &=-1+6 \\ x &=+5 \end{aligned} $$

Hence, the correct answer is option: 'A'.

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