Which of the following compound does not produce green coloured product on thermal decomposition?

Options

A. `K_(2)Cr_(2)O_(7)`
B. `KMnO_(4)`
C. `(NH_(4))_(2)Cr_(2)O_(7)`
D. `NH_(4)NO_(3)`

Explanation

To solve the question of which compound does not produce a green-colored product on thermal decomposition, we will analyze the thermal decomposition of each given compound step by step.

### Step 1: Understand Thermal Decomposition
Thermal decomposition is a chemical reaction where a compound breaks down into simpler compounds or elements when heated.

### Step 2: Analyze Each Compound
We will consider each of the compounds provided in the question:

1. **Potassium Dichromate (K₂Cr₂O₇)**:
- Upon heating, it decomposes to form potassium chromate (K₂CrO₄) and chromium(III) oxide (Cr₂O₃).
- **Products**: K₂CrO₄ (yellow) + Cr₂O₃ (green)
- **Green Product**: Yes, Cr₂O₃ is green.

2. **Potassium Permanganate (KMnO₄)**:
- Upon heating, it decomposes to form potassium manganate (K₂MnO₄) and manganese dioxide (MnO₂).
- **Products**: K₂MnO₄ (green) + MnO₂ (brown)
- **Green Product**: Yes, K₂MnO₄ is green.

3. **Ammonium Dichromate (NH₄)₂Cr₂O₇**:
- Upon heating, it decomposes to form chromium(III) oxide (Cr₂O₃) and nitrogen gas (N₂).
- **Products**: Cr₂O₃ (green) + N₂ (colorless)
- **Green Product**: Yes, Cr₂O₃ is green.

4. **Ammonium Nitrate (NH₄NO₃)**:
- Upon heating, it decomposes to form nitrous oxide (N₂O) and water (H₂O).
- **Products**: N₂O (colorless) + H₂O (colorless)
- **Green Product**: No, both products are colorless.

### Step 3: Conclusion
From the analysis, we can conclude that:
- Potassium Dichromate, Potassium Permanganate, and Ammonium Dichromate all produce green-colored products upon thermal decomposition.
- Ammonium Nitrate does not produce a green-colored product; instead, it produces colorless products.

Thus, the compound that does not produce a green-colored product on thermal decomposition is **Ammonium Nitrate (NH₄NO₃)**.

### Final Answer:
**Ammonium Nitrate (NH₄NO₃)** does not produce a green-colored product on thermal decomposition.

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