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Aluminium is usually found in +3 oxidation state. In contarast, thallium exists in +1 and +3 oxidation states. This is due to :

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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 

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Best answer

Correct option  4) inert pair effect

Explanation :

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

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