Question

Name of the structure of silicates in which three oxygen atoms of [SiO₄]^4- are shared is

(a) pyrosilicate 

(b) sheet silicate 

(c) linear chain silicate 

(d) three dimensional silicate

Answer 1

The correct option (b) sheet silicate

Explanation:

The structure of silicates has been found with the help of X-ray diffraction techniques. All silicates have tetrahedral  SiO^4-₄ ion, as a basic building unit ie, all silicates are composed of many units. Tetrahedral shape of [SiO₄]^4- ion is due to sp³ -hybridisation of Si-atom. Sheet silicates are formed when three oxygen atoms (bridging O-atoms) of each (SiO₄)^4-unit are shared. Hence, the general formula of sheet silicates is (Si₂O₅)^2n-