Highly selective Backlog Qs for JEE MainChemistryClassification of Elements and Periodicity in Properties
The stability of +1 oxidation state increases in the sequence
Options
- AAl < Ga < In < Tl
- BTl < In < Ga < Al
- CIn < Tl < Ga < Al
- DGa < In < Al < Tl
Correct answer
A. Al < Ga < In < Tl
Step-by-step solution
Key Idea Stability of lower oxidation states increases on moving down a group due to inert pair effect. The given elements belong to third group. These elements mainly exhibit +3 and +1 oxidation state. As we know the stability of lower oxidation state, i e,+1 state, increases on moving down a group, the sequence of stability is Al < Ga < In < Tl