Which of the following statement is correct?

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Allotropy of sulfur arises partly because of the great variety of molecular forms that can be achieved by $S - S$ -catenation and partly because of the numerous ways in which the molecules so formed can be arranged within the crystal.

Both $S_{2}$ and $O_{2}$ are paramagnetic species.

$BiOCl$ and $SbOCl$ can be differentiated by solubility in tartaric acid.

Van Arkel process is employed for $Zr$ , $Si$ , $Ti$ and $Ge$ for refining.

answer is A.

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Detailed Solution

Sulfur is a non-metal that can take on several different allotropes. Due to S-S catenation, Sulphur develops into its allotropic forms. Therefore, due to thermal stability, Sulphur allotropes can be converted into one another.
Both $S_{2}$ and $O_{2}$ have two unpaired electrons in their orbits, make molecules both paramagnetic.
The solubility of alcohols $BiOCl$ and $SbOCl$ in tartaric acid allows for the differentiation of the two, which are crystalline, colorless solids.

Hence, the correct option is a, b, c.

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