Corrosion of iron is essentially an electrochemical phenomenon where the cell reactions are

Fe is oxidised to Fe²⁺ and dissolved oxygen in water is reduced to O^2-

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Fe is oxidised to Fe³⁺and H₂O is reduced to O₂^2-

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Fe is oxidised to Fe²⁺ and H₂O is reduced to O₂^-

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Fe is oxidised to Fe²⁺ and H₂O is reduced to O₂

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Solution

The correct option is A Fe is oxidised to Fe²⁺ and dissolved oxygen in water is reduced to O^2-
$A n o d e : F e (s) \to F e^{2 +} (a q) + 2 e^{-}$
$C a t h o d e : 4 H^{+} + O_{2} + 4 e^{-} \to 2 H_{2} O$

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Similar questions

While $F e^{3 +}$ is stable, $M n^{3 +}$ is not stabe in acid solution because:
$(M n^{3 +} + e^{-} \to M n^{2 +}, E^{\circ} = 1.5 V; O_{2} + 4 H^{+} + 4 e^{-} \to 2 H_{2} O, E^{\circ} = + 1.23 V; F e^{3 +} + e^{-} \to F e^{2 +}, E^{\circ} = 0.77 V)$

$E^{\circ}$ value of $M g^{2 +} | M g, Z n^{2 +} | Z n$ and $F e^{2 +} | F e$ are – 2.37 V, - 0.76 V and 0.44 V respectively. Which of the following is correct?