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
Which of the following is correct according to Freundlich adsorption isotherm ?
po
p
p1/n
D.
p1/n
Freundlich proposed following empirical equation
= k p1/n or log = log k + log p
where w is the mass of gas adsorbed on a mass m of adsorbent at a pressure p , k and n are constant , which are depend on nature of the gas and the adsorbent and on temperature .
Note : Freundlich isotherm is not applicable at high pressure .
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+