Name the type of the structure of silicate in which one oxygen atom of [SiO4]4- is shared?
Sheet silicate
Pyrosilicate
Three dimensional silicate
Linear chain silicate
The catenation tendency of C, Si and Ge is in the order Ge < Si < C. The bond energies (in kJ mol-1) of C-C, Si-Si and Ge-Ge bonds, respectively are
348, 167, 180
348, 180, 167
167, 180, 348
180, 167, 348
Number of oxygen atoms shared per Si tetrahedron in
I. two dimensional sheet structured silicates
II. cyclic silicates and
III. single strand chain silicates respectively are
3, 3, 2
3, 2, 2
4, 3, 1
4, 3, 2
B.
3, 2, 2
In two dimensional sheet silicates, three oxygens of each Si units are shared. Hence, it contain (Si2O5 type anions. Cyclic silicates are obtained by sharing of two oxygen atoms of each Si tetrahedron. Chain silicates are also formed by the sharing of two oxygen atoms of each Si units.
Pure silicon doped with phosphorus is a
metallic conductor
insulator
n-type semiconductor
p-type semiconductor