Question

Maximum number of triple point for sulphur system.

• A. 3
• B. 1
• C. 2
• D. 4

Answer 1

The correct option is D 4

Maximum number of triple point for sulphur system is 4.
Not more than 3 phases can exist at triple point. Thus, S has four triple point.
$S_R\rightleftharpoons S_M\rightleftharpoons S_L$
$S_R\rightleftharpoons S_M\rightleftharpoons S_V$
$S_M\rightleftharpoons S_L\rightleftharpoons S_V$
$S_R\rightleftharpoons S_L\rightleftharpoons S_V$ (metastable state)