The electronic configuration of $\mathrm{Cu}(\mathrm{II})$ is $3 \mathrm{~d}^{9}$ whereas that of $\mathrm{Cu}(\mathrm{I})$ is $3 \mathrm{~d}^{10}$. Which of the following is correct ?

(B) Stability of $\mathrm{Cu}(\mathrm{I})$ and $\mathrm{Cu}(\mathrm{II})$ depends on nature of copper salts

(D) $\mathrm{Cu}(\mathrm{I})$ and $\mathrm{Cu}(\mathrm{II})$ are equally stable

JEE Main · 2024 · 09 Apr 2024 · Shift 1 · d and f Block Elements

The electronic configuration of

Cu (II)

3 d^{9}

whereas that of

Cu (I)

3 d^{10}

. Which of the following is correct ?

Answer: (C)

In aqueous solution Cu(II) is more stable than Cu(I): the much larger hydration enthalpy of

C u^{2 +}

outweighs the second ionisation energy. Option (3).

JEE Main · 2024 · 09 Apr 2024 · Shift 1 · Single correct option