1.

Aluminium is usually found in +3 oxidation state. In contarast, thallium exists in +1 and +3 oxidation states. This is due to : (1)  lanthanoid contraction (2)  lattice effect (3)  diagonal relationship (4)  inert pair effect 

Answer»

Correct option  4) inert pair effect

Explanation :

Due to inert pair effect Tl is stable is +1 oxidation state 



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