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Simple Circuit

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

+ 1.19 V

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0.89 V

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+ 1.83 V

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+ 0.18 V

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Solution

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

Suggest Corrections

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E^{\circ}

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