Question

Given below are two statements:

Statement $I:$ $\alpha$ and $\beta$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling.

Statement $II:$ At room temperature the stable crystalline form of sulphur is monoclinic sulphur.

In the light of the above statements, choose the correct answer from the options given below.

• A. Both statement $I$ and statement $II$ are false
• B. Statement $I$ is true but statement $II$ is false
• C. Both statement $I$ and statement $II$ are true
• D. Statement $I$ is false but statement $II$ is true

Answer 1

The correct option is B Statement $I$ is true but statement $II$ is false

At $369\text{K}$, both the forms are in equilibirum with each other.
$\begin{array}{ccc}{S}_{\text{Rhombic}}& \stackrel{369\text{K}}{\leftrightharpoons }& S_{\text{Monoclinic}}\\ (\alpha -\text{sulphur})& & (\beta -\text{sulphur})\end{array}$

At room temperature , the rhombic sulphur is the most stable.