The name 'silica' covers an entire froup of minerals which have the general formula `SiO_2` the most tetrahedra arratnged in spirals . The spirals can turn in a clockwise or anti-clockwise direction - a feature that results in these being two mirror images opticallyy active, varieties of quartz.
The following pictures represent various silicate anions.
Their formulae are respectively : ` .

Options

A. ` SiO_3^(2-)" "Si_3O_2^(2-)`
B. ` SiO_4^(4-)" "Si_3O_(10)^(8-)`
C. ` SiO_2^(4-)" "Si_3O_9^(2-)`
D. ` SiO_3^(4-)" "Si_3O_7^(8-)`

Answer

B