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(C) The standard electrode potential $(E^o_{M^{2+}/M})$ for the first series of transition metals generally decreases across the series due to the inc

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$Cu (Z=29)$

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(C) The standard electrode potential $(E^o_{M^{2+}/M})$ for the first series of transition metals generally decreases across the series due to the increase in the sum of the first and second ionization enthalpies. However,for $Cu$,the value is positive $(+0.34 \ V)$. This is because the high energy required to sublimate $Cu$ to gaseous atoms and the high ionization enthalpy required to convert $Cu(g)$ to $Cu^{2+}(g)$ are not compensated by the hydration enthalpy of $Cu^{2+}(aq)$ ions. Therefore,$Cu$ is the only element among the given options with a positive standard electrode potential.

Four successive members of the first series of the transition metals are listed below. For which one of them is the standard electrode potential $(E^o_{M^{2+}/M})$ value positive?

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