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Aluminium is usually found in +3 oxidation stagte. 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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Some p block elements, introduction to p block elements

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Ans: (4) inert pair effect

Sol: Inert pair effect is promenent character of pblock element.

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