MCQ
Why $\mathrm{Bi}^{3+}$ more stable than $\mathrm{Bi}^{+5}$ ?
- ✓Due to inert pair effect
- BDue to inert gas electronic configuration
- CDue to half filled configuration
- DDue to lanthanide Contraction
✓
Answer
Correct option: A.
Due to inert pair effect
$\mathrm{Bi}^{3+}$is more stable than $\ce{Bi^{5+}}$ due to inert pair effect. Ongoing down the group, inert pair effect increases due to more penetration of $s-$ orbital in nucleus due to which element tends to show lower oxidation state more stable than higher oxidation state. Thus, bismuth will show a strong tendency to change into $+3$ state from $+5$ state.
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