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In Lassaigne's test, prussian blue colou...

In Lassaigne's test, prussian blue colour indicates the presence of nitrogen in an organic compound.

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### Step-by-Step Solution: 1. **Understanding Lassaigne's Test**: - Lassaigne's test is a qualitative analysis method used to detect the presence of certain elements (like nitrogen, sulfur, and halogens) in organic compounds. 2. **Preparation of the Extract**: - The organic compound is fused with sodium metal to form sodium cyanide (NaCN) if nitrogen is present. This is then dissolved in water to obtain the Lassaigne's extract. ...
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