Which of the following statements are not correct?
i. Atomic radius of 
is less than that of 
ii. The order of ionization enthalpy of group elements is 
iii. Boron trioxide is amphoteric in nature
Text Solution
Verified by ExpertsA
The order of atomic radii of group 13 elements varies as:-
This is due to weak shielding of outermost electrons by 3d-subshell that causes Ga to become smaller than Al. Thus, (i) is correct.
The correct order of ionization enthalpy of group 13 elements is :-
This is due to poor shielding by d-subshells and f-subshells that result in ionization enthalpy being higher for 
and 
.
Thus, statement (ii) is incorrect.
Boron trioxide 
is acidic in nature as it is a nonmetal oxide and dissolves in water to form 
.
Thus, statement (iii) is incorrect.
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