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Equilibrium Constant from Nernst Equation

E ∘ for the c...

Question

$E^{\circ}$ for the cell is $Z n | Z n^{2 +} (a q) | | C u^{2 +} (a q) | C u$ at $25^{\circ} C$ , the equilibrium constant for the reaction $Z n + C u^{2 +} (a q) ⇌ C u + Z n^{2 +} (a q)$ is of the order of

10^-37

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10^-28

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10⁺¹⁸

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10⁺¹⁷

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Solution

The correct option is A 10^-37
$E_{c e l l}^{\circ} = \frac{0.059}{n} l o g K$
$l o g K = \frac{1.10 \times 2}{0.059} = 37.2881 \Rightarrow K = 10^{- 37}$

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