The electronic configuration of Cu (II) is `3d^(9)` whereas that of Cu (I) is `3d^(10)`. Which of the following is correct -

Options

A. Cu (II) is more stable
B. Cu (II) is less stable
C. Cu (I) and Cu (II) are equally stable
D. stability of Cu(I) and Cu(II) depends on the nature of copper salts

Answer

A

Explanation

In aqueous solution the stability of `Cu^(2+)` is greater than that of `Cu^(+)` due to the much more negative value of hydration enthalpy of `Cu^(2+)` than `Cu^(+)`, which more than compensates for the second ionisation enthalpy of Cu.