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Which of the following Lanthanoid ions is diamagnetic? 

(At. No. Ce = 58, Sm = 62, Eu = 63, Yb = 70) 

1) Eu2+ 

2) Yb2+ 

3) Ce2+ 

4) Sm2+

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Correct option is 2) Yb2+ 

All the lanthanoid ions mentioned in the question have unpaired electrons in their f-orbitals except Yb2+ which has no unpaired electron (f14). Thus it is diamagnetic.

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