The E°(M²+}/M) value for copper is positive ...

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

Question : 42 of 49

Marks: +1, -0

The E°(M

^{2+}

/M) value for copper is positive (+0.34 V). What is possibly the reason for this? (Hint: consider its high

\Delta_a

H° and low

\Delta_{hyd}

H°)

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 Cu

^{2+}

ismore than Cu.

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