How many corners of SiO4 units are shared in the formation of three dimensional silicates?
3
2
4
1
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
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
In which of the following the inert pair effect is most prominent?
C
Si
Ge
Pb
D.
Pb
Generally elements have same oxidation state as their group number but heavier p-block elements form compounds in which their oxidation state is lower than their group number. It is called inert pair effect.
All the given elements are p-block elements but Pb is heaviest among all the given elements.