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Assertion : $\mathrm{PbI}_4$ is a stable compound.
Reason: Iodide stabilizes higher oxidation state.
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Reason: Iodide stabilizes higher oxidation state.
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The correct answer is:
If both assertion and reason are false.
Due to screening effect, down the group, lower oxidation states become more stable. e.g., $\mathrm{Pb}$ (II) is more stable than $\mathrm{Pb}$ (IV). But small, highly electronegative elements like F-atoms can somewhat stabilise its higher oxidation state.
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