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NEET-XII-Chemistry

08: The d-and f-Block Elements

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  • #4
    The Eθ(M2+/M) value for copper is positive (+0.34V). What is possibly the reason for this? (Hint: consider its high ΔaHθ and low ΔhydHθ)
    Ans : The Eθ(M2+/M) value of a metal depends on the energy changes involved in the following:

    1. Sublimation: The energy required for converting one mole of an atom from the solid state to the gaseous state.



    2. Ionization: The energy required to take out electrons from one mole of atoms in the gaseous state.



    3. Hydration: The energy released when one mole of ions are hydrated.



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