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Iron II Sulphate

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Question

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Blue coloured precipitate of Prussian blue has total of iron atoms(s) 4.

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Solution

${F e}^{3 +}$ reacts with potassium ferrocyanide to form purssian blue precipitate of ferric ferrocyanide $F e_{4} [F e (C N)_{6}]_{3}$ .
Thus, the number of iron atoms in blue coloured precipitate of Prussian blue is 4.

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