Question

What will be the state of aggregation of sulphur at $298K$ and $1atm$ pressure?
A. Rhombic sulphur
B . Monoclinic sulphur
C . Triclinic sulphur
D . None of the above

Answer 1

Sulphur forms numerous allotropes. but the two most stable forms of sulphur are rhombic sulphur and monoclinic sulphur.

Complete answer:
Matter exists in three different states of matter aggregation in nature: solid, liquid, and gas. Solids have a definite volume and shape. Liquids have a constant volume, but their shape is determined by their container.
The most important characteristic of allotropes of sulphur is its thermal stability. Rhombic sulphur when heated above $369K$ gives rhombic sulphur. We can say that rhombic sulphur is stable below $369K$ and it becomes monoclinic sulphur above that temperature. $369K$ is called the transition temperature because both the allotropes of sulphur are stable at this temperature.
Therefore, the stable state of aggregation of sulphur at $298K$ and $1atm$ pressure is rhombic sulphur.

Hence, the correct option is A. Rhombic sulphur

Additional information:
Rhombic sulphur is octahedral in shape and crystalline in nature. When we heat a roll sulphur solution in $C{S_2}$, we generate rhombic sulphur. It has a specific gravity of $2.06$ and a melting point of $358.8K$ . Rhombic sulphur is not soluble in water, although it can be dissolved in benzene, ether, alcohol, and other solvents.

Note:
The attraction forces between the constituent particles of matter, as well as the relative ordering of such particles, determine these two qualities, form and volume, which serve to identify the three stages of aggregation.