Which one of the following is a correct set?
Diamond, sp2
Graphite, sp3
Diamond, sp
Graphite, sp2
How many corners of SiO4 units are shared in the formation of three dimensional silicates?
3
2
4
1
C.
4
If all the four corners, i.e. all the four oxygen atoms of each tetrahedral (SiO4) are shared with other tetrahedral (SiO4) are shared with other tetrahedral, three-dimensional network structure is obtained, i.e. different forms of silica such as quartz, tridymite and crystobalite are formed.
Which one of the following elements on doping with germanium, make it a p-type semiconductor?
Boron
Selenium
Arsenic
Germanium
Pure silicon doped with phosphorus is
amorphous
p-type semiconductor
n-type semiconductor
insulator
Which one of the following correctly represents the variation of electronegatrvity (EN) with atomic number (Z) of group 13 elements?
Al3+, Fe3+, Zn2+ and Ni2+ ions are present in an acidic solution. Excess of ammonium chloride solution followed by addition of ammonium hydroxide solution. The available precipitate will contain
Zn(OH)2 and Ni(OH)2
Al(OH)2 and Fe(OH)3
Zn(OH)2 and Al(OH)3
Ni(OH)2 and Fe(OH)3