The vast majority of silicates are insoluble in water, except alkali metal silicate. The extreme stability of silciates is due to the donation of extra electrons from O atoms into the vacant 3d-orbital of Si. The `SiO_(4)` tetrahedral units may occur singly or may share one, two , three of four O atoms through comers giving rise to cycle groups, chains infinite layers of infinite three dimensional frame work.
Select incorrect option for `(Si_(4)O_(11))_(n)^(6n-)`
A. It is the formula of double chain silicate
B. It is the formula of double chain silicate
C. It is non planar polymeric anion
D. Each silicon is surrounded by 2.5 oxygen
