Identify the incorrect statement.

• A

  Ortho silicates contain single discrete unit of ${\mathrm{SiO}}_4^{-4}$ tetrahedral

• B

  $\text{ Pyrosilicates contain two units of }{\mathrm{SiO}}_4^{-4}\text{ joined by oxygen atom }$

• C

  $\text{ Cyclic silicates have general formula }{\left({\mathrm{SiO}}_3\right)}_{\mathrm{n}}^{2\mathrm{n}-}$

• D

  $\text{ Chain silicates formed by sharing one oxygen atom with general formula }{\left({\mathrm{Si}}_6{\mathrm{O}}_{11}\right)}_{\mathrm{n}}^{2\mathrm{n}}$