Question:

Hydrogen peroxide oxidises [Fe(CN)₆]⁴⁻ to [Fe(CN)₆]³⁻ in acidic medium but reduces [Fe(CN)₆]³⁻ to [Fe(CN)₆]⁴⁻ in alkaline medium. The other products formed are, respectively:

(H₂O+O₂)and(H₂O+OH⁻)

H₂Oand(H₂O+O₂)

H₂Oand(H₂O+OH⁻)

(H₂O+O₂)andH₂O

(i) [Fe⁺²(CN)₆]⁴⁻ + H₂O₂ + 2H⁺ → [Fe⁺³(CN)₆]³⁻ + 2H₂O
(ii) [Fe⁺³(CN)₆]³⁻ + H₂O₂ + 2OH⁻ → [Fe⁺²(CN)₆]⁴⁻ + O₂ + 2H₂O