Which of the following half reactions are correctly expressed-I- CrO2-4-8H-6e- Cr3-4H2OII- I-6OH- IO-3-3H2O-6e-III- MnO-4-2H2O-3e- MnO2-4OH-

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Oxidation Number Method

Which of the ...

Question

Which of the following half reactions are correctly expressed?
I. $C r O_{4}^{2 -} + 8 H^{+} + 6 e^{-} \to C r^{3 +} + 4 H_{2} O$
II. $I^{-} + 6 O H^{-} \to I O_{3}^{-} + 3 H_{2} O + 6 e^{-}$
III. $M n O_{4}^{-} + 2 H_{2} O + 3 e^{-} \to M n O_{2} + 4 O H^{-}$

I only

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III only

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I and II only

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II and III only

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I, II and III

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Solution

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M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O; E^{o} = X_{1} V

M n O_{2} + 4 H^{+} + 2 e^{-} \to M n^{2 +} + 2 H_{2} O; E^{o} = X_{2} V

E^{o}

M n O_{4}^{-} + 4 H^{+} + 3 e^{-} \to M n O_{2} + 2 H_{2} O

C C l_{4}

S i C l_{4}

G e F_{4}

C u^{+} \to C u^{2 +} + C u

3 M n O_{4}^{-} + 4 H^{+} \to 2 M n O_{4}^{-} + M n O_{2} + 2 H_{2} O

2 K M n O_{4} \to K_{2} M n O_{4} + M n O_{2} + O_{2}

2 M n O_{4}^{-} + 3 M n^{2 +} + 2 H_{2} O \to 5 M n O_{2} + 4 H^{+}

Borax

N H_{4} C l

N a_{2} C O_{3}

N H_{4} N O_{3}

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