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Solution


Q.

The correct order of the first ionization enthalpy is                            [2024]
1 Al>Ga>Tl  
2 Tl>Ga>Al  
3 B>Al>Ga  
4 Ga>Al>B  

Ans.

(2)

Ionization enthalpy decreases down the group. In group 13, Ga and Tl have more ionization enthalpy than expected value because of poor shielding of d and f electrons respectively. Actual order of first ionization enthalpy for group 13 elements is: B>Tl>Ga>Al>In