Complete the following statement regarding the allotropic transition of sulfur by filling … — JAMB UTME

Complete the following statement regarding the allotropic transition of sulfur by filling in the blank with the correct term.

Answer:At temperatures above

96^\circ\text{C}

, rhombic sulfur changes reversibly into 【monoclinic】 sulfur.

Monoclinic (or prismatic) sulfur is the stable crystalline allotrope of sulfur above the transition temperature of

96^\circ\text{C}

Rhombic sulfur (

\alpha

-sulfur) is stable at room temperature up to

96^\circ\text{C}

. When heated above this transition temperature (

96^\circ\text{C}

), it slowly transforms into monoclinic sulfur (

\beta

-sulfur), which remains stable up to its melting point.

Identify the two main crystalline allotropes of sulfur and their transition temperature.

Rhombic sulfur (alpha-sulfur) and monoclinic sulfur (beta-sulfur) exist in dynamic equilibrium at the transition temperature of

96^\circ\text{C}

Sulfur exhibits enantiotropic allotropy where the stability of each crystalline form depends on temperature.

Determine which allotrope is stable above

96^\circ\text{C}

Monoclinic (prismatic) sulfur is stable between

96^\circ\text{C}

and its melting point of

119^\circ\text{C}

Below

96^\circ\text{C}

, rhombic sulfur is the stable form; heating it above

96^\circ\text{C}

transforms it into monoclinic sulfur.

Transition temperature of sulfur allotropes

Estimated Time:45s

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