Which of the following will be paramagnetic?

O_{2}^{2 -}

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C r^{3 +}

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N a^{+}

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C u^{+}

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Solution

The correct option is C $C r^{3 +}$
Configuration of $C r^{3 +}$ is: $[A r] 3 d^{3}$
Since there are five-3d orbitals, they are not all at least singly filled yet, and thus, all three electrons in the lowest-energy configuration are unpaired. So, this is paramagnetic.

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Similar questions

Among the following the total no. of species which are paramagnetic

$O_{2}, S_{2}, C N^{-}, N O^{+}, O_{2}^{2 +}, O_{2}^{2 -}, B_{2}, N_{2}^{2 -}, O_{2}^{+}, N O, N O_{2}, N_{2} O$ ___

N a^{+}, Z n^{2 +}, C u^{+}, F e^{3 +}

N a^{+}, Z n^{2 +}, C u^{+}, F e^{3 +}

O_{2}^{-}, O_{2}^{2 -}

C N^{-}, N O, O_{2}^{2 -}, O_{2}, N O_{2}, O_{2}^{-}, B_{2}, C_{2}, F_{2}^{-}

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