Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is:

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Canvas Classes · Accepted Answer

Step 1: Understand the Reaction Conditions

Acidic  + excess  → Prussian blue colloidal species.

Key feature: excess potassium ferrocyanide means K is present in the product.

Step 2: The Reaction

When  is in excess, the Prussian blue colloidal species formed is  (potassium ferric ferrocyanide), not the simple .

Step 3: Distinguish from the Standard Formula

| Conditions | Product |
|---|---|
| Stoichiometric/standard |  |
| Excess  |  (soluble Prussian blue / Berlin blue) |

The colloidal

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