A mixture of iodine and sulphur crystals can be separated by treatment with
A mixture of iodine and sulphur crystals can be separated by treatment with
- A) water to filter off sulphur
- B) carbon (IV) suiphide to filter off iodine
- C) ethanoic acid to filter off sulphur
- D) methanol to filter off iodine
Correct Answer: B) carbon (IV) suiphide to filter off iodine
Explanation
A mixture of iodine and sulphur crystals can be separated by treatment with carbon (IV) sulfide (also known as carbon disulfide, CS2).
The reason for using carbon (IV) sulfide is that it will dissolve iodine, but not sulphur. When the mixture is treated with carbon (IV) sulfide, iodine will dissolve in the liquid, while sulphur remains undissolved as solid particles.
After adding carbon (IV) sulfide to the mixture, the solution can then be filtered to separate the dissolved iodine (in the filtrate) from the solid sulphur (in the residue left on the filter paper). This is a simple and effective method for separating a mixture of iodine and sulphur crystals based on their difference in solubility.
The other options listed (water, ethanoic acid, and methanol) are not suitable for separating the mixture because they either do not dissolve either iodine or sulphur, or they dissolve both of them, making separation impossible.