Question

$C{u}^{2+}$ is stable in aqueous medium due to

• A. $d^{10}$ configuration
• B. $d^9$ configuration
• C. $I{P}_2>I{P}_1$
• D. Hydtation energy overcomes the other endothermic processes.

Answer 1

Answer: (B)

$d^9$ configuration

In an aqueous medium, $C{u}^{2+}$ is stable.

This is because although energy is required to remove one electron from $C{u}^{+}$ to $C{u}^{2+}$, high hydration energy of $C{u}^{2+}$ compensates for it.

Therefore, $C{u}^{+}$ ion in an aqueous solution is unstable.

It disproportionates to give $C{u}^{2+}$ and $Cu$.