CBSE
Multiple Choice QuestionsWhich ofthe following is a negatively charged sol ?
Sol of charcoal
Haemoglobin
TiO2 sol
Basic dye stuffs
Blue colour of water in sea is due to :
refraction of blue light by impurities in sea water
refraction of blue sky by water
scattering of light by impurities
All of the above
A colloidal solution is kept in dark and is illuminated by a beam of light then, brightness appears at the right angle of direction of light. This effect is called
Tyndall effect
Brownian effect
Hardy-Schulze effect
none of the above.
According to Hardy schulze law, the flocculating power of an ion increases with
decreases in size
increase in size
decrease in charge
increase in charge
Purification of colloids is done by
dialysis
peptisation
electrophoresis
coagulation.
In aerosol, the dispersion medium is :
solid
liquid
gas
all of the above
Hair cream is
gel
emulsion
solid sol
sol
A colloidal solution is kept in dark and is illuminated by a beam of light then brightness appears at the right angle of direction of light. This effect is called
Tyndall effect
Brownian effect
Hardy- Schulze effect
none of these
The work of conc. H2SO4 in esterification process is as :
dehydrating agent and catalyst
dehydrating agent
hydrolysing agent
catalyst
Assertion: Coagulation power of Al3+ is more than Na+.
Reason:Grealer the valency ofthe flocculating ion added, greater is its power to cause precipitation (Hardy-Schulze rule).
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.
