JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
The electronic configuration of \(\mathrm{Cu}\) (II) is \(3 \mathrm{d}^9\) whereas that of \(\mathrm{Cu}(\mathrm{I})\) is \(3 \mathrm{d}^{10}\). Which of the following is correct?
- A \(\mathrm{Cu}\) \((II)\) is less stable
- B Stability of \(\mathrm{Cu}\) \((I)\) and \(\mathrm{Cu}\) \((II)\) depends on nature of copper salts
- C \(\mathrm{Cu}\) \((II)\) is more stable
- D \(\mathrm{Cu}\) \((I)\) and \(\mathrm{Cu}\) \((II)\) are equally stable
Answer & Solution
Correct Answer
(C) \(\mathrm{Cu}\) \((II)\) is more stable
Step-by-step Solution
Detailed explanation
\(\mathrm{Cu}(\mathrm{II})\) is more stable than \(\mathrm{Cu}(\mathrm{I})\) because hydration energy of \(\mathrm{Cu}^{+2}\) ion compensate \(\mathrm{IE}_2\) of \(\mathrm{Cu}\).
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