Iron shows least oxidation state in which of the following?

K_{4} [F e (C N)_{6}]

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K_{3} [F e (C N)_{6}]

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F e S O_{4} (N H_{4})_{2} S O_{4} (6 H_{2} O)

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F e_{2} (C O)_{9}

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Solution

The correct option is A $F e_{2} (C O)_{9}$
The oxidation states of iron in $K_{4} [F e (C N)_{6}], K_{3} [F e (C N)_{6}], F e S O_{4} (N H_{4})_{2} S O_{4} (6 H_{2} O) a n d F e_{2} (C O)_{9}$ are $+ 2, + 3, + 2$ and $0$ respectively.
Hence, the least oxidation state of Fe is in $F e_{2} (C O)_{9}$ .

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