In the 3d series,the metal having the highest | vedclass

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(C) The standard electrode potential $(E^{\circ})$ for $M^{2+}/M$ in the $3d$ series depends on the sum of enthalpy of sublimation,ionization enthalpy

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$Cu$

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(C) The standard electrode potential $(E^{\circ})$ for $M^{2+}/M$ in the $3d$ series depends on the sum of enthalpy of sublimation,ionization enthalpy,and hydration enthalpy.$Cr^{2+}/Cr \rightarrow -0.90 \, V$$Fe^{2+}/Fe \rightarrow -0.44 \, V$$Cu^{2+}/Cu \rightarrow +0.34 \, V$$Zn^{2+}/Zn \rightarrow -0.76 \, V$Among the given options,$Cu$ has the highest positive value $(+0.34 \, V)$,which is due to its high enthalpy of atomization and low hydration enthalpy,making it the only metal in the $3d$ series with a positive $E^{\circ}$ value for the $M^{2+}/M$ couple.

In the $3d$ series,the metal having the highest $M^{2+}/M$ standard electrode potential is .... .

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