Topic: Surface Chemistry, Test No.: 01, Total MCQs: 15
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Question 1 |
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 |
Question 2 |
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 |
Question 3 |
The protecting power of lyophilic colloidal sol is expressed in terms of [CBSE AIPMT 2012]
Critical miscelle concentration | |
Oxidation number | |
Coagulation value | |
Gold number |
Question 4 |
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 |
Question 5 |
Which one of the following does not involve coagulation? [Karnataka CET 2010]
Peptization | |
Formation of delta regions | |
Treatment of drinking water by potash alum | |
Clotting of blood by the use of ferric chloride |
Question 6 |
Among the electrolytes Na2SO4, CaCl2, Al2(SO4)3 and NH4Cl, the most effective coagulating agent for Sb2S3 sol is [IIT-JEE 2009]
Na2SO4 | |
CaCl2 | |
Al2(SO4)3 | |
NH4Cl |
Question 7 |
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 |
Question 8 |
Rate of physical adsorption increase with [Karnataka CET 209]
increase in temperature | |
decrease in pressure | |
decrease in temperature | |
decrease in surface area |
Question 9 |
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 |
Question 10 |
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. |
Question 11 |
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]
n | |
1/n | |
log K | |
- log K |
Question 12 |
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. |
Question 13 |
Which of the following electrolyte will have maximum flocculation value for Fe (OH)3 sol.? [Karnataka CET 2006]
Na2S | |
(NH4)3PO4 | |
K2SO4 | |
NaCl |
Question 14 |
Which one of the followings forms micelles in aqueous solution above certain concentration? [CBSE AIPMT 2005]
Dodecyl trimethyl ammonium chloride | |
Glucose | |
Urea | |
Pyridinium chloride |
Question 15 |
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 |
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