Which of the following ions is diamagnetic?

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(D) To determine if an ion is diamagnetic,we check for the presence of unpaired electrons in its electronic configuration.$1$. $Cu^{+2}$ $(Z=29)$: The

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None of these

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(D) To determine if an ion is diamagnetic,we check for the presence of unpaired electrons in its electronic configuration.$1$. $Cu^{+2}$ $(Z=29)$: The configuration is $[Ar] 3d^9$. It has $1$ unpaired electron,so it is paramagnetic.$2$. $Cr^{+3}$ $(Z=24)$: The configuration is $[Ar] 3d^3$. It has $3$ unpaired electrons,so it is paramagnetic.$3$. $Ti^{+3}$ $(Z=22)$: The configuration is $[Ar] 3d^1$. It has $1$ unpaired electron,so it is paramagnetic.Since all the given ions have unpaired electrons,none of them are diamagnetic.

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