When ferric chloride is added to potassium ferrocyanide there is formation of

Options

A. Prussian blue
B. Nitroprusside ion
C. Coloured ring
D. Ferrous nitrate

Answer

To solve the question of what is formed when ferric chloride is added to potassium ferrocyanide, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- Ferric chloride is represented as \( \text{FeCl}_3 \).
- Potassium ferrocyanide is represented as \( \text{K}_4[\text{Fe(CN)}_6] \).

2. **Write the Reaction**:
- When ferric chloride reacts with potassium ferrocyanide, the chemical reaction can be represented as:
\[ \text{FeCl}_3 + \text{K}_4[\text{Fe(CN)}_6] \rightarrow \text{K}_3[\text{Fe}_2[\text{Fe(CN)}_6]_2] + 3\text{KCl} \]
- This reaction produces a complex compound.

3. **Identify the Product**:
- The product formed is known as potassium ferric ferrocyanide, commonly referred to as "Prussian blue" or "Persian blue".

4. **Color of the Precipitate**:
- The precipitate formed in this reaction is a dark blue color, specifically known as Persian blue.

5. **Final Answer**:
- Therefore, when ferric chloride is added to potassium ferrocyanide, the formation of a dark blue precipitate known as potassium ferric ferrocyanide (Persian blue) occurs.