JEE Main 2019 Chemistry question

ChemistryThe p-Block ElementsJEE Main 2019

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

Answer: (C)

Solution

The 6s pair of Tl is reluctant to participate in bonding.

Question ID VK-010077