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Consider the change in oxidation state of Bromine corresponding to different EMF values as shown in
\( \mathrm{P} \) the diagram below:

W
\[
\begin{array}{c}
\mathrm{BrO}_{4}^{-} \stackrel{1.82 \mathrm{~V}}{\longrightarrow} \mathrm{BrO}_{3}^{-} \stackrel{1.5 \mathrm{~V}}{\longrightarrow} \mathrm{HBrO} \\
\mathrm{Br}^{-} \stackrel{\leftarrow}{1.0652 \mathrm{~V}} \mathrm{Br}_{2} \stackrel{\leftarrow}{1.595 \mathrm{~V}}
\end{array}
\]
Then the species undergoing disproportionation is:-
(1) \( \mathrm{BrO}_{3}^{-} \)
(2) \( \mathrm{BrO}_{4}^{-} \)
(3) \( \mathrm{Br}_{2} \)
(4) \( \mathrm{HBrO} \)
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