Answer :

The E0(M2+/M) value of a metal depends on the energy changes involved in the following reactions:

1. Sublimation energy: The energy needed to convert one mole of atoms from a solid state to gaseous state.

2. Ionization energy: The energy supplied to remove electrons from one mole of atoms, which are in the gaseous state.

3. Hydration energy: The energy emitted to hydrate one mole of ions.

Now, copper has a high ionisation energy and low hydration energy. Hence, the E0(M2+/M) value for copper is positive.

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