(D) The electronic configuration of $Hg^{2+}$ is $[Xe] 4f^{14} 5d^{10}$.Since all electrons are paired in the $5d$ subshell,$Hg^{2+}$ is diamagnetic.I

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(D) The electronic configuration of $Hg^{2+}$ is $[Xe] 4f^{14} 5d^{10}$.Since all electrons are paired in the $5d$ subshell,$Hg^{2+}$ is diamagnetic.In contrast,$Co^{2+}$,$Ni^{2+}$,and $Cu^{2+}$ have unpaired electrons in their $d$-orbitals,making them paramagnetic.