The stability of Cu 2 + is more than Cu + salts in aqueous solution due to -

Step-by-step solution

The stability of Cu 2 +   ( aq ) rather than Cu +   ( aq ) is due to the much more negative ∆ hyd H o of Cu 2 +   ( aq ) than Cu +   , which more than compensates for the second ionisation enthalpy of Cu . The Cu 2 + ion has a greater charge density than Cu + ion and thus forms much stronger bonds releasing more hydration energy.