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Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power.
\( \begin{array}{lccc}\text { Ion } & \mathrm{ClO}_{4}^{-} & \mathrm{IO}_{4}^{-} & \mathrm{BrO}_{4}^{-} \\ \text {Reduction } & E^{\ominus}=1.19 \mathrm{~V} & E^{\ominus}=1.65 \mathrm{~V} & E^{\ominus}=1.74 \mathrm{~V} \\ \text { potential } E^{\ominus} / \mathrm{V} & & & \end{array} \)
(i) \( \mathrm{ClO}_{4}^{-}\mathrm{IO}_{4}^{-}\mathrm{BrO}_{4}^{-} \)
(ii) \( \mathrm{IO}_{4}^{-}\mathrm{BrO}_{4}^{-}\mathrm{ClO}_{4}^{-} \)
(iii) \( \mathrm{BrO}_{4}^{-}\mathrm{IO}_{4}^{-}\mathrm{ClO}_{4}^{-} \)
(iv) \( \mathrm{BrO}_{4}^{-}\mathrm{ClO}_{4}^{-}\mathrm{IO}_{4}^{-} \)
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