A test tube containing molasses solution and yeast is kept in a warm place overnight. The gas collected from this mixture

Options

A. extingusihes the flame
B. bursts into flame when ignited
C. turns lime water milky
D. both (a) and (c)

Explanation

### Step-by-Step Solution:

1. **Understanding the Components**:
- The test tube contains a molasses solution and yeast.
- Molasses is rich in sugars, which are the primary substrate for fermentation.

2. **Yeast and Fermentation**:
- Yeast is a microorganism that can undergo anaerobic fermentation, which means it can convert sugars into alcohol and carbon dioxide without the presence of oxygen.
- The general equation for the fermentation process is:
\[ \text{Sugar} \rightarrow \text{Ethanol (C}_2\text{H}_5\text{OH)} + \text{Carbon Dioxide (CO}_2\text{)} \]

3. **Fermentation Process**:
- When the yeast acts on the sugars in the molasses, it produces ethanol and carbon dioxide.
- The carbon dioxide produced is a gas that can be collected.

4. **Properties of Carbon Dioxide**:
- Carbon dioxide is known to extinguish flames. This means if you were to ignite a flame near the gas, it would go out.
- Additionally, when carbon dioxide is bubbled through lime water (a solution of calcium hydroxide), it reacts to form calcium carbonate, which makes the lime water turn milky.

5. **Conclusion**:
- The gas collected from the fermentation of molasses by yeast will extinguish a flame and can turn lime water milky.
- Therefore, the correct answer to the question is that the gas collected will both extinguish a flame and turn lime water milky (option "both A and C").