CBSE
Multiple Choice QuestionsGraphite is soft while diamond is hard because
graphite is in powder form
diamond has sp2 hybridisation but graphite has sp3 hybridisation
graphite is in planar form while diamond is in tetrahedral form
graphite is covalent and diamond is ionic
Aluminium vessels should not be washed with material containing washing soda since:
washing soda is expensive
washing soda is easily decomposed
washing soda reacts with Al to form insoluble aluminium oxide
washing soda reacts with Al to form soluble aluminate
In which of the following structure the number of shared O-atom per tetrahedrom is two and half?
Pyroxene chain silicate
Amphibole chain silicate
Cyclic silicate
Sheet silicate
Silicon is an important constituent of
alloys
vegetables
animals
rocks
Carborandum is
Al2O3
AlCl3
CuCO3
SiC
The hardest substance is
iron
steel
diamond
graphite
Which of the following statements is correct with respect to the property of elements with increase in atomic number in the carbon family (group 14)?
Their metallic character decreases
The stability of +2 oxidation state increases
Their ionization energy increases
Their atomic size decreases
Quartz is an example of
cyclic silicate
chain silicate
frame work silicate
sheet silicate
Which of the following statements is incorrect regarding graphite?
The structure of graphite· is two dimensional sheet like consisting of a number of benzene rings
The structure of graphite is more compact than that of diamond.
Graphite fibres embedded in plastic material form high strength, light weight composites
Graphite cleaves easily between the layers
CH3CHCl2, on hydrolysis, will give
CH3CHO
CH3COOH
CHCl3
CH3CH2OH
