The potassium ferrocyanide solution gives a Prussian blue colour, when added to:

Question

Canvas Classes · Accepted Answer

Step 1: Understand Potassium Ferrocyanide

Potassium ferrocyanide = 
- Ferrocyanide anion:  (iron in +2 oxidation state)
- It is a reducing agent (can reduce  to )

Step 2: The Prussian Blue Test

ions react with  (ferrocyanide) to form the characteristic Prussian blue precipitate:

This reaction is the basis of:
1. Lassaigne's test for nitrogen (NaCN → FeCN complex → Prussian blue with FeSO₄)
2. Qualitative analysis of  ions

Step 3: Evaluate Each Option

| Salt | Cation | Gives Prussian Bl

More questions from Practical Organic Chemistry