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

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Solution

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

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