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Nernst Equation

Standard elec...

Question

Standard electrode potential for $S n^{4 +} / S n^{2 +}$ couple is $+ 0.15 V$ and that for the $C r^{3 +} / C r$ couple is $- 0.74 V$ . these two couples in their standard state are connected to make a cell. the potential will be
(  AIPMT Priliminary Examination 2011)

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Solution

$S n^{4 +} + 2 e^{-} \to S n^{2 +}; E^{o} = + 0.15 V$ $C r^{3 +} + 3 e^{-} \to C r; E^{o} = - 0.74 V$ $E_{c e l l}^{\circ} = E_{c a t h o d e (R P)}^{\circ} - E_{a n o d e (R P)}^{\circ}$ $E_{c e l l}^{\circ} = 0.15 - (- 0.74) = + 0.89 V$

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