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  4. The standard reduction potential for Fe2+ | Fe and Sn2+ | Sn electrodes are - 0.44 and - 0.14 volt respectively. For the cell reaction Fe2+ + Sn → Fe + Sn2+, the standard emf is

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Q. The standard reduction potential for $Fe^{2+}$ | $Fe$ and $Sn^{2+}$ | $Sn$ electrodes are $- 0.44$ and $- 0.14$ volt respectively. For the cell reaction
$Fe^{2+} + Sn \to Fe + Sn^{2+}$, the standard emf is

Electrochemistry

Solution:

$2e^{-} + Fe^{2+} \to Fe$ (Reduction-half reaction)
$Sn \to Sn^{2+} + 2e^{-}$ (Oxidation-half reaction)
$E^{\circ}_{cell} = - 0.44 + 0.14 = - 0.30\, V$