CBSE
Which of the following organo - silicon compound on hydrolysis will give a three dimensional silicone ?
R3SiCl
RSiCl3
SiCl4
R2SiCl2
Assertion: Silicones are hydrophobic in nature.
Reason: Si-O- Si linkages are moisture sensitive.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.
Water gas is :
CO + N2
CO + CO2 + CH4
CO2 + N2
CO + H2
Which of the following is a carbonate ore?
Pyrolusite
Malachite
Diaspore
Cassiterite
Borax is used as a cleansing agent because on dissolving in water it gives
alkaline solution
acidic solution
bleaching solution
basic solution.
When lead nitrate is heated it produces :
NO2
NO
N2O5
N2O
Inorganic graphite is :
BN
BF3
B2H6
none of these
The energy gaps (Eg) between valence band and conduction band for diamond, silicon and germanium are in the order
Eg (diamond) > Eg (silicon) > Eg (germanium)
Eg (diamond) <Eg (silicon) <Eg (germanium)
Eg (diamond) = Eg (silicon)= Eg (germanium)
Eg (diamond)> Eg (germanium)> Eg (silicon).
Silicon is :
semi - conductor
insulator
conductor
none of these
Assertion : Borax bead test is not suitable for Al(III).
Reason : Al2O3 is insoluble in water.
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.