When a lot of dry powder of a substance X is released over a fire, the fire gets extinguished.
How does this substance extinguish the fire ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Situation**: The question states that when a dry powder of substance X is released over a fire, the fire gets extinguished. We need to identify how this substance works to put out the fire.

2. **Identifying Substance X**: The substance X referred to in the question is commonly known as baking soda, which is chemically represented as sodium bicarbonate (NaHCO₃).

3. **Mechanism of Action**: When baking soda is heated (as it would be in a fire), it undergoes a chemical reaction. This reaction produces carbon dioxide gas.

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