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Solution


Q.

Given below are the pairs of group 13 elements showing their relation in terms of atomic radius.

(B<Al), (Al<Ga), (Ga<In) and (In<Tl)

Identify the elements present in the incorrect pair and in that pair find out the element (X) that has higher ionic radius (M3+) that the other one. The atomic number of the element (X) is                 [2025]
1 31  
2 49  
3 13  
4 81  

Ans.

(1)