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Question

Which of the following ion is not diamagnetic?


A
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B
Sc3+
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C
Mg2+
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D
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Solution

The correct option is A

He+2 No. of electrons present = 3; It is paramagnetic going by molecular orbital theory, since configuration is σ1s2σ1s1
Sc3+ Diamagnetic (z = 21) but ionic configuration is 1s22s22p63s23p6.
Mg2+ Diamagnetic as it shows neon configuration
O22 Following Molecular orbital Theory, the configuration is KK,σ2s2,σ2s2,σ2p2x,π2p2y=
π2p2z,π2p2y=π2p2z


Chemistry

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