Consider the following cell reaction: 2Fe_ (s) + O_ 2(g) + 4H^+_ (aq) 2Fe^ 2+ _ (aq) + 2H_2O(l) E^ = 1.67 V At [ Fe^ 2+ ] = 10^ -3 M, P( O_2 ) = 0.1 atm and pH = 3, the cell potential at 25 °C is

JEE Advanced 2011 Chemistry question

Consider the following cell reaction: V At M, atm and pH = 3, the cell potential at 25 °C is

Answer: (D)

Four electrons are transferred (2Fe → 2Fe²⁺, or O₂ → 2H₂O), so n = 4. M. Nernst equation: $E = E° -

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Question ID VK-025947