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The p-Block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe p-Block Elements5 Marks
Question
Account for the following observations:
$\mathrm{PbO}_2$ is a stronger oxidising agent than $\mathrm{SnO}_2$.
✓

Answer

In $\mathrm{pbO}_2, \mathrm{pb}$ is in +4 oxidation state and in $\mathrm{SnO}_2$ also Sn is in +4 oxidation state. Due to the inert pair effect which is due to weak screening effect of electrons of $d$ subshell which increases from top to bottom in group thus the stability of oxidation state 2 less than common oxidation state increases on down the group thus +2 oxidation state is more stable for lead ( pb ) than +4 oxidation state thus pb changes from its +4 state to more stable +2 state easily thus it's a good oxidising agent.

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