Butter is an example of which type of colloid?
Solid in liquid
Liquid in solid
Liquid in liquid
Gas in liquid
Which of the following is incorrect for physisorption?
Reversible
Increases with increase in temperature.
Low heat of adsorption.
Increases with increase in surface area.
When a sulphur sol is evaporated sulphur is obtained .On mixing with water sulphur sol is not formed .The sol is :
lyophilic
reversible
hydrophobic
hydrophilic
An example for autocatalysis is :
oxidation of NO to NO2
oxidation of SO2 to SO3
decomposition of KClO3 to KCl and O2
oxidation of oxalic acid by acidified KMnO4
A lyophobic colloid is :
As2S3
starch
agar - agar
gelatin
A.
As2S3
Lyophobic colloids are those in which the Lyophobic colloids are those in which the dispersed phase has no attraction for the medium or the solvent .These are also known as suspensoids .These are generally Jess stable and regarded as irreversible colloids .
Example : Sulphur sol in water , Fe(OH)3 , AgCl , gold sol etc .
In coagulating the colloidal solution of As2S3 .which has the minimum coagulating value ?
NaCl
KCl
BaCl2
AlCl3
Which one of the following is not a surfactant?
CH3-(CH2)14-CH2-NH2
CH3-(CH2)16-CH2OSO2-Na+
OHC-(CH2)14-CH2-COO-Na+