The diamagnetic species among the following is : Cu2+ , Cr3+, Co3+ , Cd2+
(a) Cu2+ (b) Cd2+ (c) Cr3+ (d) Co3+


Answer: (b)
Explanation: Diamagnetic species are repelled by a magnetic field and do not have any unpaired electrons.
(a) Cu2+ (Copper ion) has the electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹ and possesses unpaired electrons, so it is not diamagnetic.
(b) Cr3+ (Chromium ion) has the electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d³ and also has unpaired electrons, so it is not diamagnetic.
(c) Co2+ (Cobalt ion) has the electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁷ and possesses unpaired electrons, so it is not diamagnetic.
(d) Cd2+ (Cadmium ion) has the electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ and does not have any unpaired electrons, so it is diamagnetic.

In summary, Cd2+ is the only species without unpaired electrons, making it the diamagnetic species.

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