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Why equilibrium constant is related to `E_("cell")^(c-)` but not to `E_("cell")` ?

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Why equilibrium constant is related to E c- cell but not to Ecell ? Select the correct answer from above options

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At equilibrium, Ecell=0 , whereas E c- cell is a constant quantity. Hence, E c- cell = RT nF lnKc= 0.059 n logKc

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