JEE Questions for Chemistry Surface Chemistry Quiz 3 - MCQExams.com

For Freundlich isotherm, a graph of a log x/m is plotted against log p. The slope of the line and its y-axis intercept, respectively corresponds to

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  • 2)
    Chemistry-Surface Chemistry-8300.png

  • Chemistry-Surface Chemistry-8301.png

  • Chemistry-Surface Chemistry-8302.png
What is the value of 1/n in Freundlich adsorption isotherm?
  • Between 2 and 4 in all cases
  • Between 0 and 1 in all cases
  • 1 in case of chemisorption
  • 1 in case of physical adsorption
Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25° C . For this process the correct statement is
  • the adsorption requires activation at 25° C
  • the adsorption is accompanied by a decrease in enthalpy
  • the adsorption increases with increase of temperature
  • the adsorption is irreversible
According to Freundlich adsorption which of the following is correct?

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  • 2)
    Chemistry-Surface Chemistry-8307.png

  • Chemistry-Surface Chemistry-8308.png
  • All of the above are correct for different range of pressure
During the adsorption of a gas on the surface of a solid, which of the following is true?
  • ∆G > 0, ∆H < 0, ∆S < 0
  • ∆G < 0, ∆H < 0, ∆S < 0
  • ∆G < 0, ∆H < 0, ∆S > 0
  • ∆G < 0, ∆H > 0, ∆S < 0
From the following which is not a surface phenomenon?
  • Corrosion
  • Crystallisation
  • Heterogeneous catalysis
  • Water and its vapour in a clossed vessel
  • None of the above
Which one of the following graphs represents Freundlich adsorption isotherm ?

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  • 2)
    Chemistry-Surface Chemistry-8313.png

  • Chemistry-Surface Chemistry-8314.png

  • Chemistry-Surface Chemistry-8315.png
Plot of log x/ m against log p is a straight line inclined at an angle of 45°. When the pressure is 0.5 atm and Freundlich parameter, k is 10, the amount of solute adsorbed per gram of adsorbent will be (log 5 = 0.
  • 1 g
  • 2 g
  • 3 g
  • 5 g
  • 2.5 g
Identify the correct statement for the adsorption of a real gas on charcoal at 1 atm and 15°C.
  • Gases which are small in molecular size are adsorbed more
  • Decrease in pressure increases the extent of adsorption
  • Gases which are easily liquefiable are adsorbed more in quantity
  • Gas which has a behaviour similar to an inert gas is adsorbed more
Which of the following is not correct ?
  • Enthalpy of physical adsorption is less compared to enthalpy of chemical adsorption
  • Milk is an example of emulsion
  • Physical adsorption increases with the increase in temperature
  • Smoke is an aerosol
Which one of the following characteristics is not correct for physical adsorption ?
  • Adsorption on solids is reversible
  • Adsorption increases with increase in temperature
  • Adsorption is spontaneous
  • Both enthalpy and entropy of adsorption are negative
Which of the following is not a characteristic of chemisorption ?
  • ∆H is the order of 400 kJ
  • Adsorption is irreversible
  • Adsorption may be multimolecular layer
  • Adsorption is specific
Which one of the following is an example of homogeneous catalysis?
  • Haber's process of synthesis of ammonia
  • Catalytic conversion of sulphur dioxide to sulphur trioxide in the contact process
  • Catalytic hydrogenation of oils
  • Catalytic conversion of water gas to methanol
  • Acid hydrolysis of methyl acetate
Which one of the following is an example for homogeneous catalysis?
  • Manufacture of sulphuric acid by Contact process
  • Manufacture of ammonia by Haber's process
  • Hydrolysis of sucrose in presence of dilute hydrochloric acid
  • Hydrogenation of oil
A catalyst is a substance which
  • increases the equilibrium constant of the reaction
  • increases equilibrium concentration of products
  • does not alter the reaction mechanism
  • changes the activation energy of the reaction
The velocity of oxidation of oxalic acid by acidified KMnO4 increases as the reaction progress. It is an example of
  • promoters
  • catalytic poisons
  • autocatalysis
  • inhibitors
An example for autocatalysis is
  • oxidation of NO to NO2
  • oxidation of SO2 to SO3
  • decomposition of KClO3 to KCl and O2
  • catalytic conversion of water gas to methanol
  • oxidation of oxalic acid by acidified KMnO4
The action of enzymes in living system is to
  • supply energy to tissues
  • create immunity
  • circulate oxygen
  • enhance the rate of biochemical reactions

Chemistry-Surface Chemistry-8322.png
  • neutralisation reaction
  • homogeneous catalysis
  • heterogeneous catalysis
  • irreversible reaction
The efficiency of enzyme catalysis is due to its capacity to
  • form a strong enzyme-substrate complex
  • change the shape of the substrate
  • lower the activation energy of the reaction
  • form a colloidal solution in water
  • decrease the bond energies in substrate molecules
In homogeneous catalysis
  • the reactants, catalyst and products are in the same phase
  • the catalyst and reactants are in the same phase
  • the catalyst and products are in the same phase
  • the reactants and products are in the same phase
Which of the following reaction is an example for homogeneous catalysis ?

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  • 2)
    Chemistry-Surface Chemistry-8326.png

  • Chemistry-Surface Chemistry-8327.png

  • Chemistry-Surface Chemistry-8328.png
Identify the correct statement regarding enzymes.
  • Enzymes are specific biological catalysts that can normally function at very high temperatures (T ~1000 K)
  • Enzymes are normally heterogeneous catalysts that are very specific in their action
  • Enzymes are specific biological catalysts that cannot be poisoned
  • Enzymes are specific biological catalysts that possess well defined active sites
Formation of ammonia from H2 and N2 by Haber's process using Fe is an example of
  • heterogeneous catalysis
  • homogeneous catalysis
  • enzyme catalysis
  • non-catalytic process
Which of the following reactions is an example of heterogeneous catalysis ?

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  • 2)
    Chemistry-Surface Chemistry-8331.png

  • Chemistry-Surface Chemistry-8332.png

  • Chemistry-Surface Chemistry-8333.png
Which of the following is an example for heterogeneous catalysis reaction ?

  • Chemistry-Surface Chemistry-8335.png
  • Hydrolysis of aqueous sucrose solution in the presence of aqueous mineral acid

  • Chemistry-Surface Chemistry-8336.png
  • Hydrolysis of liquid in the presence of aqueous mineral acid
Peptisation involves
  • precipitation of colloidal particles
  • disintegration of colloidal aggregates
  • evaporation of dispersion medium
  • Impact of molecules of the dispersion medium on the colloidal particles
Potassium stearate is obtained by the saponification of an oil or fat. It has formula CH3 —(CH2 )16 —COOK. The molecule has a lyophobic terminal CH3 and a lyophilic terminal—COOK. Potassium stearate is an example of
  • lyophilic colloid
  • lyophobic colloid
  • macromolecular colloid
  • micelle or associated colloid
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+ < Na2+ < Al3+
  • Al3+ < Na+ < Ba2+
Lyophilic sols are more stable than lyophobic sols because
  • the colloidal particles have negative charge
  • the colloidal particles have positive charge
  • the colloidal particles are solvent
  • None of the above
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