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Ion Electron Method

Fe3+ [ Fe CN ...

Question

$F e^{3} + {[F e {(C N)}_{6}]}_{6}^{3 -} \to \times H_{2} O_{2} S o l u t i o n - ------- \to Z$
Correct observation is

A

X : White, Y and Z are same (blue)

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B

X : Brown, Y and Z are same (blue)

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C

X : Brown, Y is blue, Z white

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D

X : White, Y is brown, Z white

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Solution

The correct option is B X : Brown, Y and Z are same (blue)
Ferric ions react with potassium ferricyanide to form brown colored ferric ferricyanide (compound X). The oxidation state of all the iron atoms is +3.
The compound X reacts with hydrogen peroxide to give purssian's blue, ferric ferrocyaninde (compound Z). Th oxidation state of iron in the ionization sphere is +3 and the oxidation state of iron in the ionization sphere is +2. Thus, this iron atom is reduced.
$F e^{3} + [F e C N_{6}]^{3 -} \to F e [F e (C N)_{6}] X H_{2} O_{2} S o l u t i o n - ------- \to F e_{4} [F e (C N)_{6}]_{3} Z$

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