Which of the following statement is correct?

Options

A. Allotropy of sulphur 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.
B. Both `S_(2)` and `O_(2)` are paramagnetic species.
C. `BiOCI` and `SbOCI` can be differentiated by solubility in tartatic acid.
D. Van Arkel process is employed for `Zr, Ti, Si` and Ge for refining.

Answer

A, B, C

Explanation

(c) `BiOCI` is insoluble in tartatic acid while `SbOCI` is soluble.
(d) Si is not refined by van-Arkel process. `Ti,Zr, B,Hf,Th` only can be refined by this method.