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
Which will liberate bromine from a solution of potassium bromide?
I2
Cl2
SO2
HI
B.
Cl2
Since, E° of Cl2 is higher than that of Br2 therefore Cl, has a higher tendency to accept electrons than Br-. Conversely, Br- ion has a higher tendency to lose electrons than Cl- ion. Therefore, the following reaction will occur
KBr K+ + Br-
2Br- + Cl2 2Cl- + Br2
Thus, Br- ions are oxidised to Br2 by Cl2, which itself is reduced to Cl- ions.
Pure silicon doped with phosphorus is a
metallic conductor
insulator
n-type semiconductor
p-type semiconductor