If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process?
xm=fT at constant P
p=fT at constant x/m
xm=p×T
xm=fp at constant T
Which mixture of the solutions will lead to the formation of negatively charged colloidal [AgI]I- sol?
50 mL of 0.1 M AgNO3 + 50 mL of 0.1 M KI
50 mL of 1 M AgNO3 + 50 mL of 0.5 M KI
50 mL of 1 M AgNO3 + 50 mL of 2 M KI
50 mL of 2M AgNO3 + 50 mL of 1.5 M KI
During electro-osmosis of Fe(OH)3 sol-
Sol particles move towards the anode.
Sol particles move towards the cathode of a sol.
Higher is the gold number, greater will be the protective power of a lyophilic colloid.
The dispersion medium moves towards the anode.
According to Freundlich adsorption isotherm, at high pressure, the value of xm is -
Directly proportional to the pressure.
Inversely proportional to the pressure.
Directly proportional to the square of the pressure.
Independent of pressure.
The gas that will be adsorbed more readily on the surface of charcoal is :
CO2
NH3
Br2
N2
The correct option representing a Freundlich adsorption isotherm is-
xm=kp0.3
xm=kp2.5
xm=kp-0.5
xm=kp-1
Emulsifying agent stabilized the emulsion of oil in water by
Forming an interfacial film between suspended particles and the medium
Dissolving the suspended particles into the medium completely
Coagulating the suspended particles from medium completely
Converting the suspended particles into vapor completely
If 227g of charcoal having, active surface area 1000 m2/g is used for monolayer absorption of a gas having molecular radius 10-8 cm, then volume of the absorbed gas at STP is [Avogadro's number = 6 × 1023]
11.2 L
22.4 L
7.46 L
3.73 L
Among the following, the surfactant that will form micelles in aqueous solution at the highest molar concentration
CH3 - CH214 - OSO3- K+
CH3 - CH210 - COO- Na+
CH3 - CH211 - COO3- Na+
CH3 - CH215 - N+H3 Bre
The decreasing order of coagulating power of an electrolyte to coagulate the As2S3 sol is
NaCl > Al2SO43 > Ba3PO42
Ba3PO42 > NaCl > Al2SO43
Al2SO43 > Ba3PO42 > NaCl
NaCl >Ba3PO42 > Al2SO43
When detergent is added in water, some properties are measured with respect to concentration. Choose the incorrect plot.
The coagulation of 100 ml of colloidal solution of gold is completely prevented by the addition of 0.25 gm of a substance 'X' to it before adding 1 ml of 10% NaCl solution. The gold number of 'X' is
25
0.25
2.5
0.025
Which is correct in case of van der Waals adsorption?
High temperature; low pressure
Low temperature; high pressure
Low temperature; low pressure
High temperature; high pressure
The volumes of gasses H2, CH4, NH3 and CO2 adsorbed by 1 g of charcoal at 298 K in the decreasing order are
NH3, CO2, CH4, H2
CO2, NH3, H2, CH4
H2, CH4, CO2, NH3
3. CH4, NH3, CO2, H2
The coagulation of 200 mL of a positive colloid took place when 0.73 g HCl was added to it without changing the volume much. The flocculation value of HCl for the colloid is
36.5
100
200
150
The coagulating power of electrolytes having ions Na+, Al3+, and Ba2+for arsenic sulphide sol increases in the order :
Al3+<Ba2+<Na+
Na+<Ba2+<Al3+
Ba2+<Na+<Al3+
Al3+<Na+<Ba2+
The Brownian motion of colloidal particles is due to -
Temperature fluctuations within the liquid phase.
Attraction and repulsion between charges on the colloidal particles.
Impact of the molecules of the dispersion medium on the colloidal particles.
None of the above.
When the temperature is increased -
The extent of adsorption increases in physisorption.
The extent of adsorption decreases in physisorption.
No effect on adsorption.
Extent of adsorption first decreases then increases.
Measuring Zeta potential is useful in determining the following property of colloidal solution -
Solubility.
Stability of the colloidal particles.
Size of the colloidal particles.
Viscosity.
Who coined the term catalysis and was awarded Nobel Prize?
Berzelius
Kolbe
Wholer
Rutherford
Catalytic poisoners act by:
coagulating the catalyst
getting adsorbed on the active centres on the surface of catalyst
chemical combination with any one of the reactants
None of the above
Which characteristic is not correct for physical adsorption?
Adsorption is spontaneous
Both enthalpy and entropy change of adsorption are negative
Adsorption on solid is reversible
Adsorption increases with an increase in temperature
A catalyst increases the rate of reaction because it:
Increases the activation energy
Decreases the energy barrier for the reaction
Decreases the collision diameter
Increases the temperature coefficient
In Langmuir's model of adsorption of a gas on a solid surface:
the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered
the adsorption at a single site on the surface may involve multiple molecules at the same time
the mass of gas striking a given area of surface is proportional to the pressure of the gas
the mass of gas striking a given area of surface is independent of the pressure of the gas
Rate of physisorption increases with:
Decrease in temperature
Increase in temperature
Decrease in pressure
Decrease in surface area
Adsorption of a gas on solid metal surface is spontaneous and exothermic, then:
H increases
S increases
G increases
S decreases
Identify the correct statement regarding enzymes:
Enzymes are specific biological catalyst that possess well defined active states
Enzymes are normally heterogeneous catalyst that are very specific in their action
Enzymes are specific biological catalysts that can not be poisoned
Enzymes are specific biological catalysts that can normally function at very high temperature (T≃1000K)
Which of the following statements is incorrect regarding physisorptions?
More easily liquefiable gases are adsorbed readily
Under high pressure it results into multimolecular layer on the adsorbent surface
Enthalpy of adsorption (∆Hadsorption) is low and positive
It occurs because of van der Waal's forces
A catalyst:
Increases the average kinetic energy of the reacting molecules
Alters the reaction path mechanism
Increases the frequency of collisions of the reacting species
A catalyst is a substance that:
Increases the equilibrium constant of the reaction
Changes the equilibrium conc. of reaction
Shortens the time to reach equilibrium
Supplies the energy of the reaction
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