CBSE
Multiple Choice QuestionsAssertion : Conductivity of silicon increases by doping it with group-15 elements.
Reason : Doping means introduction of small amount of impurities like P, As or Bi into the pure crystal.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Which of the following is an example of chain silicates?
Kaolinite
Zircon
Benitonite
Diopside
The repeating unit in silicone is
SiO2
R2Si-O-
Which of the following products are formed when SiCl4 vapour are passed over hot Mg ?
SiCl2 + MgCl2
Si + MgCl2
Mg2Si + MgCl2
MgSiCl6
Crystalline form of silica is called :
crystalline silicon
quartz
rock
talc
Which material is used as a neutron moderator?
Graphite
Cadmium
Boron
Uranium
The elements commonly used for making transistors are :
Ga and In
C and Si
P and As
Si and Ge
Which of the following shows bond in silicone?
Si-C-Si-C-Si
Si-Si-Si-Si
-Si-O-Si-O-Si-
Si-C-Si-O-Si
Which of the following gas is linear ?
CO2
SO2
NO2
SO3
Diborane is used for reduction of :
carboxylic acids
esters
nitro groups
Both (a) and (b)
