is more stable in its +1 oxidation state than +3 oxidation state.

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Solution

The correct option is B Tl
Due to inert pair effect, Tl(+1) is more stable than Tl(+3). The valence "s” electrons act as inner core electrons due to poor shielding of "d” and "f” electrons is called as inert pair effect.

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Similar questions

In which of the following $+ 1$ oxidation state is more stable than $+ 3$ ?

In which of the following elements +1 oxidation state is more stable than +3 oxidation state?

T l C l_{3}

T l C l

+ 1

T l

+ 3

Z = 25

+ 2

+ 3

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