Question

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

Comments

Some p block elements, introduction to p block elements

Answer 1

Ans: (4) inert pair effect

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