Solve this following
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


Correct Option: , 4

Solution:

Inert pair effect is promenent character of pblock element.

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