Lassaigne's test is not very successful for diazonium salts. Assign reason.

Explanation

### 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. It involves fusing the organic compound with sodium metal and then treating the resulting mixture with water to extract the soluble sodium salts.

2. **Nature of Diazonium Salts**: Diazonium salts are organic compounds that contain a diazonium group (R-N₂⁺), where R is an organic group. They are generally unstable and can decompose easily.

3. **Reaction of Diazonium Salts Upon Heating**: When diazonium salts are heated, they undergo decomposition. The nitrogen gas (N₂) is released as a byproduct, which is a stable diatomic molecule. The reaction can be represented as:
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