Manisha took some vinegar in a test tube and added some baking soda to it. Then she lit a matchstick and brought it near the mouth of the test tube. The flame of matchstick got extinguished.
Which of the following is correct conclusion regarding the given experiment?

Options

A. Carbon dioxide gas does not support burning.
B. Air contains carbon dioxide.
C. Oxygen gas present in the air is necessary for burning.
D. Oxygen gas can extinguish fire.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Experiment**: Manisha took vinegar and added baking soda to it in a test tube. This combination is known to produce a chemical reaction.

2. **Identifying the Reaction**: When vinegar (an acid) reacts with baking soda (a base), it produces carbon dioxide gas along with water and sodium acetate. The reaction can be represented as:
\[ \text{Vinegar (Acetic Acid)} + \text{Baking Soda (Sodium Bicarbonate)} \rightarrow \text{Carbon Dioxide} + \text{Water} + \text{Sodium Acetate} \]

3. **Observing the Effect on Flame**: After the reaction starts, Manisha brought a lit matchstick near the mouth of the test tube. The flame got extinguished.

4. **Analyzing the Cause of Extinguishing Flame**: The carbon dioxide gas produced during the reaction is denser than air and does not support combustion. This means that when the matchstick is brought near the test tube, the carbon dioxide gas prevents the flame from getting the oxygen it needs to continue burning.

5. **Conclusion**: The correct conclusion from this experiment is that carbon dioxide does not support burning. Therefore, the flame of the matchstick was extinguished because carbon dioxide was present in the test tube.

6. **Final Statement**: The correct conclusion regarding the experiment is that carbon dioxide gas does not support burning, leading to the extinguishing of the matchstick flame.

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