Fe³⁺ cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of:

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Strategy:
 Write out the classical qualitative analysis reaction between Iron(III) and potassium ferrocyanide.

Step 1: The reaction
When  reacts with potassium ferrocyanide, , it undergoes a double displacement to form a highly insoluble, deep blue complex known as Prussian green/blue.

Step 2: Identify the product
The deep Prussian blue precipitate is Iron(III) hexacyanidoferrate(II), whose exact formulation is .

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