Q.

Diamagnetic Lanthanoid ions are:                        [2024]

1 Nd3+Eu3+  
2 La3+Ce4+  
3 Nd3+Ce4+  
4 Lu3+Eu3+  

Ans.

(2)

Substances that are weakly repelled by magnetic field are called diamagnetic substances. Atoms having all electrons paired are diamagnetic.