How many of the following oxidizing reaction of $K M n O_{4}$ occurs in acidic medium?
(i) $F e^{2 +} (g r e e n)$ is converted to $F e^{3 +} (y e l l o w)$
(ii) Iodide is converted to iodate.
(iii) Thiosulphate oxidized to sulphate.
(iv) Nitrite is oxidized to nitrate.

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answer is 2.

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Detailed Solution

i) $5 F e^{2 +} + M n O_{4}^{-} + 8 H^{+} \to M n^{2 +} + 4 H_{2} O + 5 F e^{3 +}$
iv) $5 N O_{2}^{-} + 2 M n O_{4}^{-} + 6 H^{+} \to 2 M n^{2 +} + 5 N O_{3}^{-} + 3 H_{2} O$

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