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Solution


Q.

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence              [2015, 2009]
1 Al<Ga<In<Tl  
2 Tl<In<Ga<Al  
3 In<Tl<Ga<Al  
4 Ga<In<Al<Tl  

Ans.

(1)

In group 13 elements, stability of +3 oxidation state decreases down the group while that of +1 oxidation state increases due to inert pair effect. Hence, stability of +1 oxidation state increases in the sequence: Al<Ga<In<Tl.