What is the importance of ultra pure silicon ? How it is Obtained

Answer

A`to`p,q,r,s ; B`to`P,Q,R,S ; C`to`P,Q ; D`to`P,Q

Explanation

(A)Two oxygen atoms per tetrahedron are shared forming rings.`(SiO_3)_n^(2n-)`.Hybridisation of each Si is `sp^3`.
(B)Two oxygen atoms per tetrahedran are shared forming a chain of tetrahedron, `(SiO_3)_n^(2n-)`, Hybridisation of each Si atom is `sp^3`.
(C )One oxygen atom per tetrahedron is shared . `Si_2O_7^(2-)` .Hybridisation of each Si atom is `sp^3`.
(D)Three oxygen atom per tetrahedron is shared . `(Si_2O_5)_n^(2-)` .`sp^3` hybridisation .