EoRP and their respective half reactions for some changes are given below-a MnO4- aq - 8 H- - 5e - Mn2- aq - 4H2Ol- Eo - - 1-52 Vb MnO42- aq - 4H- - 2e - MnO2 s - 2H2Ol - Eo - - 2-26 Vc 2MnO4- aq - 2e - 2MnO42- aq - Eo - -0-56 V acid med-d Mn3- - e - Mn2- - Eo - -1-51 V acid med-e Mn4- - e - Mn3- - Eo - 0-95 V acid med-The most stable oxidation state of Mn is -

The correct option is A Mn^2+ From the above chemical series, #160; Mn ^ 2+ is a more stable oxidation state than Mn . #160;Because in ...

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Electrolysis and Electrolytes

EoRP and thei...

Question

$E_{R P}^{o}$ and their respective half reactions for some changes are given below:

(a) $M n O_{4}^{-} (a q) + 8 H^{+} + 5 e \to M n^{2 +} (a q) + 4 H_{2} O (l); E^{o} = + 1.52 V$
(b) $M n O_{4}^{2 -} (a q) + 4 H^{+} + 2 e \to M n O_{2} (s) + 2 H_{2} O (l); E^{o} = + 2.26 V$
(c) $2 M n O_{4}^{-} (a q) + 2 e \to 2 M n O_{4}^{2 -} (a q); E^{o} = + 0.56 V$ (acid med.)
(d) $M n^{3 +} + e \to M n^{2 +}; E^{o} = + 1.51 V$ (acid med.)
(e) $M n^{4 +} + e \to M n^{3 +}; E^{o} = 0.95 V$ (acid med.)

The most stable oxidation state of Mn is :

M n^{2 +}

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M n^{4 +}

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M n^{7 +}

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M n^{6 +}

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Solution

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E^{o}

Δ G^{o}

k J

5 C e^{4 +} (a q) + M n^{2 +} (a q) + 4 H_{2} O (l) \to M n O_{4}^{-} (a q) + 8 H^{+} (a q) M n O_{4}^{-} (a q) + 5 e^{-} \to M n^{2 +} (a q) + 4 H_{2} O (l); E^{o} = + 1.51 V C e^{4 +} + e^{-} \to C e^{3 +} (a q); E^{o} = + 1.61 V

M n O_{4}^{-} (a q .) + 8 H^{+} (a q .) + 5 e^{-} \to M n^{2 +} (a q .) + 4 H_{2} O (l); E^{o} = 1.51 V

C r_{2} O_{7}^{2 -} (a q .) + 14 H^{+} (a q .) + 6 e^{-} \to 2 C r^{3 +} (a q .) + 7 H_{2} O (l); E^{o} = 1.38 V

F e^{3 +} (a q .) + e^{-} \to F e^{2 +} (a q .); E^{o} = 0.77 V

C l_{2} (g) + 2 e^{-} \to 2 C l^{-} (a q .); E^{o} = 1.40 V

F e (N O_{3})_{2}

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

F_{2 (g)} + 2 e^{-} \to 2 F_{(a q)}^{-}; E^{o} = + 2.85 V

{C l}_{2 (g)} + 2 e^{-} \to 2 {C l}_{(a q)}^{-}; E^{o} = + 1.36 V

{B r}_{2 (l)} + 2 e^{-} \to 2 {B r}_{(a q)}^{-}; E^{o} = + 1.06 V

I_{2 (g)} + e^{-} \to 2 I_{(a q)}^{-}; E^{o} = + 0.53 V

M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O; E^{O} = 1.51 V; Δ G_{1}^{0} = - 5 \times 1.51 \times F

M n O_{2} + 4 H^{+} + 2 e^{-} \to M n^{2 +} + 2 H_{2} O; E^{O} = 1.23 V; Δ G_{2}^{0} = - 5 \times 1.23 \times F

E_{M n O_{4}^{-} | M n O_{2}}^{\circ}

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