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NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions

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Question : 42
Total: 49
The E°(M‌2+/M) value for copper is positive (+0.34 V). What is possibly the reason for this? (Hint: consider its high ΔaH° and low ΔhydH°)
Solution:  
The high energy to transform Cu‌(s)to Cu ‌2+‌(aq) is not found balancedby its hydration energy. Hydration energy and lattice energy of Cu‌2+ ismore than Cu.
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