MCQ
Transitional elements are named transition elements because their characters are
- ✓In between $ s$ and $ p -$ block elements
- BLike that of $p $ and $d -$ block elements
- CThey are members of $I -A$ group
- DThey are like inactive elements
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Reason: Due to formation of a complex
${{O}_{(g)}}+{{e}^{-}}=O_{(g)}^{-}\Delta {{H}^{o}}=-142\ kJ\,mo{{l}^{-1}}$
$O_{(g)}^{-}+{{e}^{-}}=O_{(g)}^{2-}\Delta {{H}^{o}}=844\ kJ\,mo{{l}^{-1}}$