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

ferrocyanide

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hydrogen cyanide

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sodium cyanide

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All of the above.

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Solution

The correct option is A ferrocyanide
Reddish brown precipitate of ferric hydroxide dissolves in hydrochloric acid and ferric chloride is formed.
$F e (O H)_{3} + 3 H C l \to F e C l_{3} + 3 H_{2} O$
When the solution containing ferric chloride is treated with potassium ferrocyanide solution a blue precipitate/colouration is obtained. The colour of the precipitate is Prussian blue. It is ferric ferrocyanide
$F e C l_{3} + 3 K_{4} [F e (C N)_{6}] Potassium ferrocyanide \to F e [F e (C N)_{6}]_{3} Prussian Blue Precipitate + 12 K C l$

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Similar questions

F e^{3 +}

F e^{3 +}

{F e}^{3 +}

H_{2} S

d i l . H N O_{3}

The intense blue colour of Prussian blue salts arises from:

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