The correct option among the following is :
Colloidal medicines are more effective because they have small surface area.
Addition of alum to water makes it unfit for drinking .
Colloidal particles in lyophobic sols can be precipitated by electrophoresis.
Brownian motion in colloidal solution is faster if the viscosity of the solution is very high.
Peptization is a :
process of bringing colloidal molecule into solution
process of converting soluble particles to form colloidal solution
process of converting precipitate into colloidal solution
process of converting a colloidal solution into precipitate
The principle of column chromatography is:
Differential absorption of the substances on the solid phase.
Differential adsorption of the substances on the solid phase.
Among the following, the INCORRECT statement about colloids is:
They can scatter light.
They are larger than small molecules and have high molar mass.
The osmotic pressure of a colloidal solution is of a higher order than the true solution at the same concentration.
The range of diameters of colloidal particles is between 1 and 1000 nm.
A gas undergoes physical adsorption on a surface and follows the given Freundlich
adsorption isotherm equation
Adsorption of the gas increases with:
Decrease in p and increase in T
Decrease in p and decrease in T
Increase in p and decrease in T
Increase in p and increase in T
Adsorption of a gas follows Freundlich adsorption isotherm. x is the mass of the gas adsorbed on mass m of the adsorbent. The plot of versus is shown in the given graph. is proportional to :
The reason for “drug induced poisoning” is :
Binding reversibly at the active site of the enzyme
Bringing conformational change in the binding site of enzyme
Binding irreversibly to the active site of the enzyme
Binding at the allosteric sites of the enzyme
An example of solid sol is :
Hair cream .
The correct match between Item I and Item II is :
Item I Item II
(A) Allosteric effect (P) Molecule binding to the active site of enzyme
(B) Competitive inhibitor (Q) Molecule crucial for communication in the body
(c) Receptor (R) Molecule binding to a site other than the active site of enzyme
(D) Poison (S) Molecule binding to the enzyme covalently
(A) (P) ; (B) (R) ; (C) (Q); (D) (S)
(A) (R) ; (B) (P) ; (C) (S); (D) (Q)
(A) (R) ; (B) (P) ; (C) (Q); (D) (S)
(A) (P) ; (B) (R) ; (C) (S); (D) (Q)
Among the following, the false statement is :
Tyndall effect can be used to distinguish between a colloidal solution and a true solution :
Latex is a colloidal solution of rubber particles which are positively charged
It is possible to cause artificial rain by throwing electrified sand carrying charge opposite to the one on clouds from an aeroplane.
Lyophilic sol can be caogulated by adding an electrolyte.
Which of the following is not an example of heterogeneous catalytic reaction ?
Combustion of coal
Hydrogenatoin of vegetable oils
Wilkinson catalyst is :
Hemoglobin and gold sol are example of:
Positively charged sols
Negatively charged sols
Positively and negatively charged sol respectively
Negatively and positively charged sols,respectively
On the basis of data given above predict which of the following gases shows least adsorption on a definite amount of charcoal ?
Physical Adsorption -
If the accumulation of gas on the surface of a solid occurs on account of weak van der Walls forces, the adsorption is termed as physical adsorption or physisorption.
adsorption directly proportional to critical temperature.
As we have learned in the gaseous state the smaller the value of the critical temperature of the gas, lesser is the amount of adsorption.
so least adsorbed gas is H2 at its LT is 33K
The correct match between Item I and Item II is:
Item I Item II
(A) Benzaldehyde (P) Mobile phase
(B) Alumina (Q) Adsorbant
(C) Acetonitrile (R) Adsorbate
A dsorption of gas follows Freundlich adsorbtin isotherm. In the given plox ,x is the mass of the gas adsorbent at pressure P. is propotional to: