Which of the following statements regarding sulphur is incorrect?
- A$S_2$ molecule is paramagnetic.
- BThe vapour at $200\, ^oC$ consists mostly of $S_8$ rings.
- CAt $600\, ^oC$ the gas mainly consists of $S_2$ molecules.
- DThe oxidation state of sulphur is never less than $+4$ in its compounds.
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