Silicon oil is obtained from the hydrolysis and polymerisation of
trimetylchlorosilane and dimethyldichlorosilane
trimethylchlorosilane and methyldichlorosilane
methyltrichlorosilane and dimethyldichlorosilane
triethylchlorosilane and dimethyldichlorosilane
The orange solid on heating gives a colourless gas and a green solid which can be reduced to metal by aluminium powder. The orange and the green solids are, respectively
NH4Cr2O7 and Cr2O3
Na2Cr2O7 and Cr2O3
K2Cr2O7 and CrO3
(NH4)2CrO4 and CrO3
Which of the following oxides is strongly basic?
TI2O
B2O3
Al2O3
Ga2O3
A.
TI2O
As we move down the group, the basic nature of the oxides of group 13 elements increases. TI2O in aqueous solution gives TIOH which is as strong a base as alkali metal hydroxides.
Match the following.
List I | List II | ||
(A) | Flespar | (I) | [Ag3SbS3] |
(B) | Asbestos | (II) | Al2O3.H2O |
(C) | Pyrargyrite | (III) | MgSO4.H2O |
(D) | Diaspore | (IV) | KAlSi3O8 |
(V) | CaMg3(SiO3)4 |
(A) (B) (C) (D)
IV V II I
(A) (B) (C) (D)
IV V I II
(A) (B) (C) (D)
IV I III II
(A) (B) (C) (D)
II V IV I
Diamond is hard because
all the four valence electrons are bonded to each carbon atoms by covalent bonds
it is a giant molecule
it is made up of carbon atoms
it cannot be burnt
Monosilane on coming in contact with air bums with a luminous flame producing vortex rings. These rings are of
SiO2
SiO
Si
H2SiO3