Four mixtures are given here:
I. Sand + Sugar.
II. Chalk powder + Salt.
III. Salt + Sugar
IV. Sugar + Charcoal.
Which of the following statements is correct regarding these mixtures?

Options

A. Mixture III can easily be separated into its constituents by using water as solvent.
B. Mixture IV can easily be separated by using carbon disulphide as solvent as charcoal is soluble in carbon disulphide.
C. Mixture I can easily be separated by using water as solvent followed by filtration and evaporation.
D. Mixture II can easily be separated by using a magnet.

Answer

To solve the question regarding the mixtures, we will analyze each mixture and determine the correct statements about their separation methods.

### Step-by-Step Solution:

1. **Identify the Mixtures:**
- Mixture I: Sand + Sugar
- Mixture II: Chalk powder + Salt
- Mixture III: Salt + Sugar
- Mixture IV: Sugar + Charcoal

2. **Analyze Mixture I (Sand + Sugar):**
- Sand is insoluble in water, while sugar is soluble.
- We can separate sand and sugar by dissolving sugar in water and then filtering the mixture. The sand will remain as residue, and the sugar solution can be obtained by evaporating the water.
- **Conclusion:** This mixture can be separated by filtration and evaporation.

3. **Analyze Mixture II (Chalk powder + Salt):**
- Chalk powder is insoluble in water, while salt is soluble.
- Similar to Mixture I, we can add water to dissolve the salt. The chalk powder will remain undissolved and can be filtered out.
- **Conclusion:** This mixture can also be separated by filtration.

4. **Analyze Mixture III (Salt + Sugar):**
- Both salt and sugar are soluble in water. Therefore, if we mix them with water, they will both dissolve, forming a homogeneous solution.
- We cannot separate them using water since both components will dissolve.
- **Conclusion:** This mixture cannot be easily separated using water.

5. **Analyze Mixture IV (Sugar + Charcoal):**
- Sugar is soluble in water, while charcoal is not.
- We can dissolve the sugar in water, and the charcoal will remain undissolved. We can then filter the mixture to separate the charcoal from the sugar solution.
- **Conclusion:** This mixture can be separated by filtration.

6. **Final Evaluation of Statements:**
- Mixture I can be separated by filtration and evaporation.
- Mixture II can be separated by filtration.
- Mixture III cannot be easily separated using water.
- Mixture IV can be separated by filtration.

### Correct Statement:
The correct statement regarding these mixtures is that Mixture I (Sand + Sugar) and Mixture IV (Sugar + Charcoal) can be separated using water, while Mixture III (Salt + Sugar) cannot be separated easily.