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Question
Answer the following.
Distinguish between rhombic sulfur and monoclinic sulfur.
Solution
The following are the points of difference between rhombic (α-sulfur) and monoclinic (β - sulfur):
| Rhombic sulfur (α-sulfur) |
Monoclinic sulfur (β- sulfur) |
| 1. It is a pale yellow coloured solid. | 1. It is bright yellow solid |
| 2. It forms orthorhombic crystals | 2. It forms needle-shaped monoclinic crystals |
| 3. Its melting point is 385.8 K. | 3. Its melting point is 393 K. |
| 4. Its density is 2.06 g/cm3 | 4. Its density is 1.98 g/cm3 |
| 5. It is insoluble in water and soluble in CS2 | 5. Soluble in CS2 |
| 6. It is stable below 369 K and transforms to β-sulfur above this temperature | 6. It is stable above 369 K and transforms into α-sulfur below this temperature. |
| 7. It is prepared by the evaporation of rolls sulfur in CS2. | 7. It is prepared from rhombic sulfur. |
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