CBSE
Multiple Choice QuestionsWhich of the following statements is not correct?
Silicon is extensively used as a semiconductor
Carborundum is SiC
Silicon occurs in free state in nature
Mica contains the element silicon
CO is poisnous gas, antidote for CO poisoning is
carborundum
carbogen
corbonic acid
pure oxygen
The basic structural unit of silicates is
SiO-
Which of the following is used in making rinter's ink, shoe polish, black varnish and paint?
Lamp black
Bone black
Carbon black
None of these
The borax bead test the coloured ions give characteristic coloured beads due to formation of
metal borates
metal metaborates
metal phosphates
metal tetraborates
Which of the following is electron deficient?
(CH3)2
(SiH3)2
(BH3)2
PH3
Which of the following statements regarding ozone is not correct?
The ozone molecule is angular in shape.
The ozone is a resonance hybrid of two structures.
The oxygen-oxygen bond length in ozone is identical with that of molecular oxygen
Ozone is used as germicide and disinfectant for the purification of air
Which of these is not a monomer for a high molecular mass silicone polymer?
MeSiCl3
Me2SiCl2
Me3SiCl
PhSiCl3
BCl3 + H2OX, the products formed in the reaction are
B2O3 + HOCl
H3BO3 + HCl
B2H6 + HCl
no reaction
The purest form of coal is :
peat
anthracite
bituminous
lignite
