Which of the following ions is diamagnetic?
Correct answer A. Zn²⁺
Explanation
Zn²⁺ is [Ar]3d¹⁰, so all its electrons are paired and it is diamagnetic. Cu²⁺ (3d⁹), Fe²⁺ (3d⁶) and Ni²⁺ (3d⁸) all contain unpaired electrons and are paramagnetic.
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