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 (T1000K)

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

  • Increases the activation energy

  • 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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