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Solution


Q.

The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively:                  [2025]
1 B and Ga  
2 B and Tl  
3 Tl and B  
4 B and In  

Ans.

(4)

Order of first ionization enthalpy of group 13 elements is: B > Tl > Ga > Al > In.