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
Pure silicon doped with phosphorus is a
metallic conductor
insulator
n-type semiconductor
p-type semiconductor
Which of the following is the electron deficient molecule?
PH3
SiH4
D.
In each B-atom used sp3 -hybrid orbitals for bonding. Out of four sp3 -hybrid orbitals, one orbital is empty. Here, one half-filled orbital of other B-atom overlaps with one empty orbital of other B-atom and half-filled orbitals of hydrogen atom resulting in 3 centred two electron bridge bonds.
Thus, these bonds are electron deficient.