The electronic configuration of \( \mathrm{Cu} \) (II) is \( 3 d^{9...

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The electronic configuration of \( \mathrm{Cu} \) (II) is \( 3 d^{9} \) whereas that of \( \mathrm{Cu}(\mathrm{I}) \) is \( 3 d^{10} \). Which of the following is correct?
(i) \( \mathrm{Cu}(\mathrm{II}) \) is more stable
\( \mathrm{P} \)
(ii) \( \mathrm{Cu} \) (II) is less stable
W
(iii) \( \mathrm{Cu}(\mathrm{I}) \) and \( \mathrm{Cu}(\mathrm{II}) \) are equally stable
(iv) Stability of \( \mathrm{Cu} \) (I) and \( \mathrm{Cu} \) (II) depends on nature of copper salts
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