JEE Main Chemistry question

In III A group, Tl (thallium) shows +1 oxidation state while other members show +3 oxidation state, why?

(A)Presence of lone electron in Tl
(B)Inert pair effectCorrect
(C)Large ionic radius of Tl ion
(D)None of the above

Answer: (B)

Solution

Down group 13, the electron pair in Tl becomes increasingly reluctant to participate in bonding (the inert pair effect), so Tl preferentially shows the +1 state instead of

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Question ID VK-138196