Question
Distinguish between rhombic sulfur and monoclinic sulfur.
| Rhombic sulphur | Monoclinic sulphur |
| 1. It is pale yellow. | 1. It is bright yellow. |
| 2. Orthorhombic crystals | 2. Needle-shaped monoclinic crystals |
| 3. Melting point, $385.8\ K$ | 3. Melting point, $393 K$ |
| 4. Density, $2.069 g/cm^3$ | 4. Density: $1.989\ g/cm^3$ |
| 5. Insoluble in water, but soluble in $CS_2$ | 5. Soluble in $CS_2$ |
| 6. It is stable below $369\ K$ and transforms to α-sulphur above this temperature. | 6. It is stable above $369\ K$ and transforms into $\beta$-sulphur below this temperature. |
| 7. It exists as $S_8$ molecules with a structure of a puckered ring. | 7. It exists as $S_8$ molecules with a structure of a puckered ring. |
| 8. It is obtained by the evaporation of roll sulphur in $CS_2$ | 8. It is prepared by melting rhombic sulphur and cooling it till a crust is formed. Two holes are pierced in the crust and the remaining liquid is poured to obtain needle-shaped crystals of monoclinic sulphur ($\beta$-sulphur). |
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