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Question

If the following half-reactions are combined in a galvanic cell, what will be the standard potential?
(Equation 1) ${C o}^{3 +} (a q) + e^{-} \to {C o}^{2 +} (a q)$ ; $E^{o} = 1.82 V$
(Equation 2) ${N a}^{+} (a q) + e^{-} \to N a (s)$ ; $E^{o} = - 2.71 V$

4.53 V

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0.89 V

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- 0.89 V

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- 4.53 V

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Solution

The correct option is A $4.53 V$
In the given reaction, $C o^{3 +}$ will be reduced and $N a (s)$ will be oxidised. Combined cell reaction can be written as:

$C o^{3 +} + N a (s) \to C o^{2 +} + N a^{+}$

$E^{0} = E_{c a t h o d e}^{0} - E_{a n o d e}^{0} = 1.82 - (- 2.71) = 4.53 V$

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F e (N O_{3})_{2}

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