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Which of the following expressions is correct for the rate of reaction given below?
\[
5 \mathrm{Br}^{-}(\mathrm{aq})+\mathrm{BrO}_{3}^{-}(\mathrm{aq})+6 \mathrm{H}^{+}(\mathrm{aq}) \longrightarrow 3 \mathrm{Br}_{2}(\mathrm{aq})+3 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})
\]
(i) \( \frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta \mathrm{t}}=5 \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta \mathrm{t}} \)
(ii) \( \frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta \mathrm{t}}=\frac{6}{5} \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta \mathrm{t}} \)
(iii) \( \frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta \mathrm{t}}=\frac{5}{6} \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta \mathrm{t}} \)
(iv) \( \frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta \mathrm{t}}=6 \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta \mathrm{t}} \)
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