Which of the following statements regarding sulfur is incorrect?

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$S_{2}$ molecule is paramagnetic.

At $200^{\circ} C$ , sulfur contains mostly $S_{8}$ rings.

At $600^{\circ} C$ the gas mainly consists of $S_{2}$ molecules.

The oxidation state of sulfur is never less than +4 in its compounds.

answer is C.

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Detailed Solution

Like $O_{2}$ , $S_{2}$ molecule is also paramagnetic.

Rhombic sulfur melts at $113^{\circ} C$ while monoclinic sulfur melts at $119^{\circ} C$ . On heating above these temperatures, the viscosity of sulfur increases till $200^{\circ} C$ and after that viscosity decreases. The reason for such behavior is cited as follows. Till $200^{\circ} C$ , long S-S chains can be maintained i.e., $S_{8}$ molecules exists in majority as vapors. After $200^{\circ} C$ , $S_{8}$ units breaks into $S_{6}, S_{4} a n d S_{2} .$ At $600^{\circ} C$ , sulfur mainly consists of $S_{2}$ units. At very high temperatures, atomic sulfur persists.