If an aqueous solution of glucose allowed to freeze then crystal of which will be separated out first

Options

A. Glucose
B. water
C. both of these
D. none of these

Explanation

To solve the question, "If an aqueous solution of glucose is allowed to freeze, then which crystal will be separated out first?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Freezing Point**:
- The freezing point is the temperature at which a liquid turns into a solid. In the case of an aqueous solution, the solvent is water, and the solute is glucose.

2. **Behavior of Aqueous Solutions**:
- When an aqueous solution freezes, the solvent (water) will start to solidify before the solute (glucose) does. This is because the freezing point of the solution is lower than that of pure water due to the presence of the solute.

3. **Freezing Process**:
- As the temperature drops, the water molecules begin to arrange themselves into a solid structure (ice). The glucose molecules remain in the solution because they do not crystallize out at the same temperature as water.

4. **Crystallization**:
- The first solid to form during the freezing of an aqueous solution is ice (frozen water). The glucose molecules will remain dissolved in the liquid phase until the temperature is lowered significantly.

5. **Conclusion**:
- Therefore, when an aqueous solution of glucose is allowed to freeze, the first crystal that will be separated out is water (ice).

### Final Answer:
The crystal that will be separated out first is **water**.

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