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The standard ...

Question

The standard electrode potential (reduction) of $P t / F e^{2 -}, F e^{3 +}$ and $P t / S n^{4 +}, S n^{2 +}$ are 0.77 V and 0.15 v respectively at $25^{o}$ C The standard EMF of the reaction $S n^{4 +} + 2 F e^{2 +} \to S n^{2 +} + 2 F e^{3 +}$ is:

1.69 V

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-0.92 V

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+ 0.31 V

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+ 0.85 V

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Solution

The correct option is A 1.69 V
$F e^{+ 2} \to F e^{+ 3} + e^{-} = 0.77 V$
$S n^{+ 4} + 2 e^{-} \to S n^{+ 2} = 0.15 V$
$2 F e^{+ 2} \to 2 F e^{+ 3} + 2 e^{-} = 1.54$
$S n^{+ 4} + 2 e^{-} \to S n^{+ 2} = 0.15$
$S n^{+ 4} + 2 F e^{+ 2} \to 2 F e^{+ 3} + S n^{+ 2} = 1.69$

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Similar questions

2 F e^{3 +} \to 3 I^{-} ⇌ 2 F e^{2 +}, I_{3}^{-}

0.77

0.54

F e^{3 +} | F e^{2 +}

I_{3}^{-} | I^{-}

298 K

2 F e^{3 +} + S n^{2 +} \to 2 F e^{2 +} + S n^{4 +}

E_{S n^{4 +} / S n^{2 +}}^{\circ} = 0.15 v o l t; E_{F e^{3 +} / F e^{2 +}}^{\circ} = 0.771 v o l t

F e^{2 +} + 2 e \to F e

F e^{3 +} + 3 e \to F e

- 0.440

- 0.036

(E^{0})

F e^{3 +} + e \to F e^{2 +}

E_{F e^{3 +} / F e^{2 +}}^{\circ} = + 0.77 V; E_{S n^{2 +} / S n}^{\circ} = - 0.14 V

S n_{(s)} + 2 F e_{(a q)}^{3 +} \to 2 F e_{(a q)}^{2 +} + S n_{(a q)}^{2 +}

F e^{3 +} + 3 e ⇌ F e, E^{o}

F e^{3 +} + e ⇌ F e^{2 +}

E^{o}

F e^{2 +} + 2 e ⇌ F e

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