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An aqueous solution of sugar is taken in...

An aqueous solution of sugar is taken in a beaker. At freezing point of solution

A

Crystals of sugar separated

B

Crystals of glucose and fructose are separated

C

Crystals of ice separated

D

Mixture of ice and some sugar crystals separated

Text Solution

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The correct Answer is:
To solve the question regarding the behavior of an aqueous solution of sugar at its freezing point, we can follow these steps: ### Step 1: Understand the Freezing Point Depression When a solute (like sugar) is dissolved in a solvent (like water), the freezing point of the solution is lower than that of the pure solvent. This phenomenon is known as freezing point depression. **Hint:** Remember that adding a solute to a solvent lowers the freezing point of the solution. ### Step 2: Identify the Components of the Solution In an aqueous solution of sugar, the solution consists of water (the solvent) and sugar (the solute). When the temperature of the solution is lowered to its freezing point, the water molecules will start to form solid ice. **Hint:** Consider what happens to the water molecules as the temperature decreases. ### Step 3: Analyze the Freezing Process As the solution approaches its freezing point, the water molecules will begin to crystallize into ice. However, since sugar is a non-volatile solute, it does not crystallize out as readily as water. Instead, the sugar remains dissolved in the solution until the temperature is sufficiently low. **Hint:** Think about the order in which components crystallize when the temperature drops. ### Step 4: Determine Which Crystals Form First At the freezing point of the solution, the first solid to separate out will be the ice crystals, as the water freezes before the sugar can crystallize. This means that the mixture will consist of ice and some remaining sugar in solution. **Hint:** Focus on the physical state changes that occur as the temperature reaches the freezing point. ### Step 5: Conclusion Based on the analysis, when an aqueous solution of sugar is taken to its freezing point, the first solid that separates out will be ice crystals. Therefore, the correct conclusion is that a mixture of ice and some sugar crystals will be present. **Final Answer:** At the freezing point of an aqueous sugar solution, a mixture of ice and some sugar crystals separates out.
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