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Solution


Q.

Gadolinium has a low value of third ionisation enthalpy because of          [2022]
1 small size  
2 high exchange enthalpy  
3 high electronegativity  
4 high basic character  

Ans.

(2)

Due to high exchange enthalpy, Gd3+(4f7) acquires extra stability and has low third ionisation enthalpy.