Read name silica covers an entire group of minereal, which have the general formual `SiO_(2)`, the mole common of which is quartz. Quartz is form work silicane with `SiO_(4)` tetrahedra arranged in spirals. The spirals can turn in a clockwise or anticlockwise direction a feature that results in there being two mirror images, optically active, varieties of quartz.
The following pictures represent various silcate anions. Their formulae are respectively.

Options

A. `SiO_(3)^(2-)Si_(3)O_(7)^(2-)`
B. `SiO_(4)^(4-)Si_(3)O_(10)^(8-)`
C. `SiO_(4)^(2-)Si_(3)O_(9)^(2-)`
D. `SiO_(3)^(4-)Si_(3)O_(7)^(8-)`

Answer

B