Standard reduction potential values for the electrodes are given below- Mg2- - 2e- Mg - Eored - -2-37 V Zn2- - 2e- Zn - Eored - -0-76 V Fe2- - 2e- Fe - Eored - -0-44 VWhich of the following statement is correct -

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Application of Electrolysis

Standard redu...

Question

Standard reduction potential values for the electrodes are given below.
$M g^{2 +} + 2 e^{-} \to M g;$ $E_{r e d}^{o} =$ $- 2.37$ V
$Z n^{2 +} + 2 e^{-} \to Z n;$ $E_{r e d}^{o} =$ $- 0.76$ V
$F e^{2 +} + 2 e^{-} \to F e;$ $E_{r e d}^{o} =$ $- 0.44$ V
Which of the following statement is correct ?

Zinc will reduce Fe

^{2 +}

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Zinc will reduce Mg

^{2 +}

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Mg oxidises Fe

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Zinc oxidises Fe

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M g^{2 +} + 2 e^{-} \to M g; E^{0} = - 2.37 V

Z n^{2 +} + 2 e^{-} \to Z n; E^{0} = - 0.76 V

F e^{2 +} + 2 e^{-} \to F e; E^{0} = - 0.44 V

Z n^{2 +} + 2 e^{-} \to Z n; E = - 0.76 V

F e^{2 +} + 2 e^{-} \to F e; E = - 0.44 V

F e^{2 +} = Z n^{-} \to Z n^{2 +} + F e

2 F e^{2 +} + C l_{2} \to 2 F e^{3 +} + 2 C l

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

E_{r e d}^{o}

C l_{2} + 2 e^{-} \to 2 C l^{-}

E_{r e d}^{o}

A : C r_{2} O_{7}^{2 -} | C r^{3 +}, E_{r e d}^{o} = 1.33

B : F e^{3 +} | F e^{2 +}, E_{r e d}^{o} = 0.77

Z n \to Z n^{2 +} + 2 e^{-} (E_{(Z n^{2 +} / Z n)}^{0} = - 0.76 V)

F e \to F e^{2 +} + 2 e^{-} E^{0} = 0.41 V

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

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