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Q.

Which of the following lanthanoid ions is diamagnetic

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a

 Eu2+ 

b

Yb2+ 

c

 Ce2+ 

d

Sm2+

answer is B.

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Detailed Solution

  • When exposed to a magnetic field, materials that are diamagnetic become freely magnetised. 
  • The magnetization, however, is moving in the opposite direction to the magnetic field. Diamagnetism is the name for the magnetism shown by certain materials.
  • No unpaired electron exists in a lanthanoid ion, which makes it diamagnetic. Yb+2 is diamagnetic due to the lack of unpaired electrons.
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