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
The rust of iron is catalysed by which of the following ?
Fe
O2
Zn
H+
B.
O2
Iron is rusted in presence of oxygen and moisture .
+ H2CO3
At anode
H2CO3 2H+ + CO32-
Fe Fe2+ + 2e-
Fe + O2 + 4H2O Fe2O3 + 8H+
At cathode
H+ + e- H
4H + O2 2H2O
Hence , rusting of iron is catalysed by hydrogen ion (H+)
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+