First slide
Atomic and physical properties
Question

Which of the following metal (s) show (s) +1and +3 oxidation states both?

Easy
Solution

Ga ,In and Tl exhibits +1 and+3 oxidation states.

InTl+1 and Tl +3  ;Tl+3 oxidation state is unstable due to inert pair effect so in +3 state it acts as oxidiszng agent

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