Cuprous ion is diamagnetic. This is due to the _________________.

Half-filled - d-orbitals

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Completly filled d-orbitals

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presence of 4s - orbitals

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No electrons in inner d-orbitals

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Solution

The correct option is B Completly filled d-orbitals
Cuprous ion ( $C u^{+}$ ) has $d^{10}$ configuration, no unpair electron so cuprous ion is diamagnetic due to completly filled d-orbitals.

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