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(i) Oxidation of` Fe^(2+)` by `Cr_2O_7^(2-)` . in acidic medium.
(ii) Oxidation of `S_2O_3^(2-)` by ` MnO_4^-` in neutral medium.
(iii) Oxidation of `I^-` by `MnO_4^-` in alkaline medium.
(iv) Oxidation of `SO_3^(2-)`by `Cr_2O_7^(2-)` in acidic medium.
(v) Oxidation of sulphur dioxide by `MnO_4^-` in acidic medium.
(vi) Reaction of potassium iodide with acidified potassium dichromate.

Explanation