A mixture of common salt, sulphur, and iron filings is shaken with carbon disulphide and filtered through a filter paper. The filtrate is evaporated to dryness in a China dish. What will be left in the dish after evaporation?

Options

A. Sand
B. Sulphur
C. Iron filings
D. Common salt

Explanation

To solve the question, we need to analyze the components of the mixture and their behavior when shaken with carbon disulphide.

### Step-by-Step Solution:

1. **Identify the Components of the Mixture**:
The mixture consists of common salt, sulphur, and iron filings.

2. **Understand the Solubility in Carbon Disulphide**:
When the mixture is shaken with carbon disulphide, we need to determine which components are soluble in it.
- Common salt (sodium chloride) is generally soluble in water but not in carbon disulphide.
- Iron filings are not soluble in carbon disulphide.
- Sulphur, however, is soluble in carbon disulphide.

3. **Shake the Mixture with Carbon Disulphide**:
When the mixture is shaken with carbon disulphide, only sulphur will dissolve, while common salt and iron filings will remain undissolved.

4. **Filter the Mixture**:
After shaking, the mixture is filtered through filter paper. The solid residues (common salt and iron filings) will remain on the filter paper, while the liquid (the filtrate) containing dissolved sulphur will pass through.

5. **Evaporate the Filtrate**:
The next step is to evaporate the filtrate in a china dish. As the carbon disulphide evaporates, it will leave behind the dissolved sulphur.

6. **Conclusion**:
After the evaporation of carbon disulphide, the only component that will be left in the china dish is sulphur.

### Final Answer:
After evaporation, sulphur will be left in the dish.

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