Question

The stability of $Cu^{2+}$ is more than $Cu^+$ salts in aqueous solution due to

• A. Enthalpy of atomization
• B. Hydration energy
• C. Second ionisation enthalpy
• D. First ionisation enthalpy

Answer 1

Answer: (B)

Hydration energy

Answer 2

$Cu_{(s)} \to Cu_{(g)} \to Cu_{(g)}^+ \to Cu_{(g)}^{2+} \to Cu_{(aq)}^{2+}$
Because $Cu^{2+}$ releases more hydration energy than $Cu^+$, it is more stable than the latter.
Therefore, The correct option is (B): Hydration energy