Topic: Surface Chemistry, Test No.: 01, Total MCQs: 15
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In Freundlich Adsorption isotherm, the value of 1/n is [CBSE AIPMT 2012]
1 in case of physical adsorption
1 in case of chemisorption
Between 0 and 1 in all cases
Between 2 and 4 in all cases
Which one of the following statement is incorrect about enzyme catalysis? [CBSE AIPMT 2012]
Enzymes are denaturated by ultraviolet rays and at high temperature
Enzymes are least reactive at optimum temperature
Enzymes are mostly proteinous in nature
Enzyme action is specific
The protecting power of lyophilic colloidal sol is expressed in terms of [CBSE AIPMT 2012]
Critical miscelle concentration
Which one of the following is an example for homogenous catalysis? [Karnataka CET 2010]
Hydrogenation of oil
Manufacture of ammonia by Haber's process
Manufacture of sulphuric acid by Contact process
Hydrolysis of sucrose in presence of dilute hydrochloric acid
Which one of the following does not involve coagulation? [Karnataka CET 2010]
Formation of delta regions
Treatment of drinking water by potash alum
Clotting of blood by the use of ferric chloride
Among the electrolytes Na2SO4, CaCl2, Al2(SO4)3 and NH4Cl, the most effective coagulating agent for Sb2S3 sol is [IIT-JEE 2009]
Which of the following statements is incorrect regarding physisorption? [AIEEE 2009]
It occurs because of van der Walls forces
More easily liquefiable gases are adsorbed readily
Under high pressure it results into multimolecular layer on adsorbent surface
Enthalpy of adsorption (ΔHadsorption) is low and positive
Rate of physical adsorption increase with [Karnataka CET 209]
increase in temperature
decrease in pressure
decrease in temperature
decrease in surface area
Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005 respectively. The correct order of their protective powers is [AIEEE 2008]
B < D < A < C
D < A < C < B
C < B < D < A
A < C < B < D
The Langmuir adsorption isotherm is deduced using the assumption [CBSE AIPMT 2007]
The adsorbed molecules interact with each other.
The adsorption takes place in multilayers.
The adsorption sites are equivalent in their ability to adsorb the particles.
The heat of adsorption varies with coverage.
A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to [CBSE AIPMT 2006]
- log K
In Langmuir's model of adsorption of a gas on a solid surface [AIEEE 2006]
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.
the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered.
Which of the following electrolyte will have maximum flocculation value for Fe (OH)3 sol.? [Karnataka CET 2006]
Which one of the followings forms micelles in aqueous solution above certain concentration? [CBSE AIPMT 2005]
Dodecyl trimethyl ammonium chloride
Which of the following statement about the zeolites is false? [CBSE AIPMT 2004]
They have open structure which enables them to take up small molecules.
Zeolites are aluminosilicates having three dimensional network.
Some of the SiO4-4 units are replaced by AlO4-5 and AlO6-9 ion in zeolites.
They are used as cation exchangers