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

Stability of Cu ( I ) and Cu (II) depends on nature of copper salts

Cu ( I ) and Cu ( II ) are equally stable

Chemistry · d and f Block Elements

JEE Main 2024 — 9 April, Shift 1 — Question 70

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

Option A:
$\mathrm{Cu}(\mathrm{II})$ is less stable
Option B:
Stability of $\mathrm{Cu}(\mathrm{I})$ and Cu (II) depends on nature of copper salts
Option C:
$\mathrm{Cu}(\mathrm{II})$ is more stable
Correct
Option D:
$\mathrm{Cu}(\mathrm{I})$ and $\mathrm{Cu}(\mathrm{II})$ are equally stable

Answer: C

Step-by-step solution

$\mathrm{Cu}(\mathrm{II})$ is more stable than $\mathrm{Cu}(\mathrm{I})$ because hydration energy of $\mathrm{Cu}^{+2}$ ion compensate $\mathrm{IE}_{2}$ of Cu .

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Exam: JEE Main 2024
Paper: 9 April, Shift 1
Subject: Chemistry
Chapter: d and f Block Elements
Topic: Introduction and Properties of Transition Elements

Number of colourless lanthanoid ions among the following is . Eu^3+, Lu^3+, Nd^3+, La^3+, Sm^3+

Answer: C

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