Select the correct IUPAC name for $[F e F_{4} (O H_{2})_{2}]^{-}$ .

Diaquatetrafluoroiron(III) ion

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Diaquatetrafluoroferrate(III) ion

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Diaquatetrafluoroiron(I) ion

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Diaquatetrafluoroferrate(I) ion

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Solution

The correct option is B Diaquatetrafluoroferrate(III) ion
In $[F e F_{4} (O H_{2})_{2}]^{-}$ the oxidation state of iron is $+ 3$ so correct IUPAC name is diaquatetrafluoroferrate(III) ion.

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