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The electronic configuration of \( \mathrm{Cu} \) (II) is \( 3 d^{9} \) while that of \( \mathrm{Cu}(\mathrm{I}) \) is \( 3 d^{10} \). Identify the correct statement.
(a) \( \mathrm{Cu} \) (II) is less stable
(b) \( \mathrm{Cu} \) (II) is more stable
(c) \( \mathrm{Cu}(\mathrm{I}) \) and \( \mathrm{Cu}(\mathrm{II}) \) are equally stable
(d) Stability of both \( \mathrm{Cu} \) (I) and \( \mathrm{Cu} \) (II) depends on the nature of copper salts
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