Question

$\beta$ sulphur is stable between :

• A. ${114}^{o}C$ to ${160}^{o}C$
• B. ${95.6}^{o}C$ to ${119}^{o}C$
• C. ${160}^{o}C$ to ${230}^{o}C$
• D. ${112.8}^{o}C$ to ${140}^{o}C$

Answer 1

The correct option is B ${95.6}^{o}C$ to ${119}^{o}C$

Beta-Sulphur is a yellow solid with a monoclinic crystal form and is less dense than α-sulfur. Like the α- form it contains puckered $S_8$ rings and only differs from it in the way the rings are packed in the crystal. It is unusual because it is only stable above $95.6℃$, below this it converts to α-sulfur. It has an observed melting point of $119℃$.