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Dilution

Fe3+ ions in ...

Question

$F e^{3 +}$ ions in an aq. solution gives deep red colouration with both sodium acetate (in excess) and ammonium thiocyanate (slightly acidic).
The deep red colouration obtained with ammonium thiocyanate gets decolourised on addition of solution containing $F^{-}$ ions.
The deep Red colouration is due to the formation of :

F e (C H_{4} C O O)

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F e (O H)_{2} C H_{3} C O O

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[F e_{3} (O H)_{2} (C H_{3} C O O)_{6}]^{+}

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[F e_{3} (C H_{3} C O O)_{6}]

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Solution

The correct option is C $[F e_{3} (O H)_{2} (C H_{3} C O O)_{6}]^{+}$
Red Colour is due to $[F e_{3} (O H)_{2} (C H_{3} C O O)_{6}]^{+}$ and $F e S C N^{2 +}$

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