On treating sodium fusion extract with sodium nitroprusside, a violet colour was observed. This indicates the presence of which element in the organic compound?

Options

A. Nitrogen
B. Sulphur
C. Chlorine
D. Bromine

Answer

To determine which element is indicated by the violet color observed when treating a sodium fusion extract with sodium nitroprusside, we can follow these steps:

### Step 1: Understand the Sodium Fusion Test
The sodium fusion test is a qualitative analysis method used to detect certain elements in organic compounds. When an organic compound is fused with sodium, it can release elements like sulfur, nitrogen, and halogens.

**Hint:** Remember that sodium fusion helps to convert elements in the organic compound into their respective sodium salts.

### Step 2: Identify the Reaction with Sodium Nitroprusside
Sodium nitroprusside is a reagent that can react with certain ions to produce a color change. Specifically, it is known to produce a violet or purple color in the presence of sulfide ions (S²⁻).

**Hint:** Focus on the specific color changes associated with different ions when using sodium nitroprusside.

### Step 3: Analyze the Violet Color Observation
The violet color observed indicates the presence of sulfide ions. When sodium fusion extract containing sulfur is treated with sodium nitroprusside, it forms a complex that exhibits a violet color.

**Hint:** Consider what elements are known to produce a violet color when reacted with sodium nitroprusside.

### Step 4: Conclusion
Since the violet color is specifically associated with the presence of sulfur in the organic compound, we conclude that the element indicated by the violet color is sulfur.

**Final Answer:** The presence of sulfur in the organic compound is indicated by the violet color observed when treating the sodium fusion extract with sodium nitroprusside.