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  4. Which among the following does not form polyhalide ion?

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Q. Which among the following does not form polyhalide ion?

MHT CETMHT CET 2019The p-Block Elements - Part2

Solution:

When the halide ions combine with halogen molecules or interhalogen, univalent ions are obtained. These are known as polyhalide ions. Among the given options, $F$ doesn't form polyhalide ion because it doesn't have $d$-orbitals and cannot show higher oxidation state.