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# The E ^Ominus (M^2+ / M) value for copper is positive(+0.34V). What is possible reason for this? (Hint: consider its high Delta_ a H^Ominus and low Delta_hyd H^Ominus)

8.4     The $E^{\ominus }(M^{2+}/M)$ value for copper is positive $(+0.34V)$. What is possible reason for this? (Hint: consider its high $\Delta _{a}H^{\ominus }$ and low $\Delta _{hyd}H^{\ominus }$)

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The $E^{\ominus }(M^{2+}/M)$ value for metal depends on-

• Sublimation energy
• Ionisation energy
• Hydration energy

Copper has a high value of atomisation enthalpy and low hydration energy. Thus, as a result, the overall effect is  $E^{\ominus }(M^{2+}/M)$ for copper is positive.

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