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In the Lassaigne's test for the detectio...

In the Lassaigne's test for the detection of nitrogen in an organic compound, the appearance of blue coloured compound is due to

A

ferric ferricyanide

B

ferrous ferricyanide

C

ferric ferrocyanide

D

ferrous ferrocyanide

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**Step-by-Step Solution:** 1. **Understanding the Lassaigne's Test**: The Lassaigne's test is a qualitative analysis method used to detect the presence of nitrogen in an organic compound. When an organic compound containing nitrogen is heated with sodium, sodium cyanide (NaCN) is formed. 2. **Formation of Sodium Ferrocyanide**: The sodium cyanide (NaCN) produced in the first step reacts with iron (Fe) to form sodium ferrocyanide (Na4[Fe(CN)6]). This compound is crucial for the subsequent steps in the test. 3. **Reaction with Ferric Chloride**: The sodium ferrocyanide then reacts with ferric chloride (FeCl3). This reaction leads to the formation of ferriferrocyanide, which is represented as Fe3[Fe(CN)6]. 4. **Color of the Compound**: The compound formed, ferriferrocyanide, is known for its distinct blue color, commonly referred to as Prussian blue. This blue color is a key indicator in the Lassaigne's test for nitrogen. 5. **Conclusion**: The appearance of the blue-colored compound in Lassaigne's test is due to the formation of ferriferrocyanide, which is blue in color. **Final Answer**: The appearance of the blue-colored compound in the Lassaigne's test for nitrogen is due to the formation of ferriferrocyanide (Prussian blue). ---
**Step-by-Step Solution:** 1. **Understanding the Lassaigne's Test**: The Lassaigne's test is a qualitative analysis method used to detect the presence of nitrogen in an organic compound. When an organic compound containing nitrogen is heated with sodium, sodium cyanide (NaCN) is formed. 2. **Formation of Sodium Ferrocyanide**: The sodium cyanide (NaCN) produced in the first step reacts with iron (Fe) to form sodium ferrocyanide (Na4[Fe(CN)6]). This compound is crucial for the subsequent steps in the test. 3. **Reaction with Ferric Chloride**: The sodium ferrocyanide then reacts with ferric chloride (FeCl3). This reaction leads to the formation of ferriferrocyanide, which is represented as Fe3[Fe(CN)6]. ...
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