Prussian blue is obtained by mixing together an aqueous solution of $F e^{3 +}$ salt with:

Ferricyanide

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Ferrocyanide

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Hydrogen Cyanide

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None of these

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Solution

The correct option is A Ferrocyanide
Prussian blue (ferric ferrocyanide) is obtained by mixing together an aqueous solution of $F e^{3 +}$ salt with ferrocyanide.

$3 K_{4} [F e (C N)_{6}] + 4 F e C l_{3} \to F e_{4} [F e (C N)_{6}]_{3} + 12 K C l$
(Prussian blue)
Hence, the correct option is (B).

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