Question

The transition temperature of sulphur is

• A. \(369^\circ C\)
• B. \(369~K\)
• C. \(133~K\)
• D. \(133^\circ C\) \bigskip

Hint:

Transition temperature of sulphur: \[ 95.6^\circ C = 369K \] A favourite NCERT fact-based question.

Answer 1

The Correct Option is B

Concept: Sulphur exhibits allotropy and exists mainly in two crystalline forms: \[ \text{Rhombic sulphur} \] and \[ \text{Monoclinic sulphur} \] The temperature at which these two allotropes coexist in equilibrium is called the transition temperature.

Step 1: Recall the standard transition temperature of sulphur.
The transition temperature between rhombic and monoclinic sulphur is \[ 95.6^\circ C \]

Step 2: Convert Celsius to Kelvin.
\[ T=95.6+273 \] \[ T=368.6K \] \[ T\approx369K \]

Step 3: Compare with options.
The correct value is \[ \boxed{369K} \] which corresponds to option (B).