ABC26PH1412 · The adsorption of a gas on a solid surface exhibits the following isotherm. Which one of the following statements is true? · JUNE 2011
ABC26PH1413 · Isothermal which has fractional coverage, linearly, dependent1 on pressure at low pressures but almost independent at high pressure is… · JUNE 2011
ABC26PH0562 · At 273 K and 10 bar, the langmuir adsorption of a gas on a solid surface gave the fraction of surface coverage as 0.01. The Langmuir… · 2005-2021self-practice
ABC26PH0212 · The Langmuir adsorption isotherm is given by theta =kp/(1+kp), where P is the pressure of the adsorabate gas. The Langmuir adsorption… · DEC 2011
ABC26PH0563 · A monoatomic gas, X , adsorbed on a surface, Langmuir adsorption isotherm. A plot of the fraction of surface coverage, theta against the… · 2005-2021
ABC26PH1415 · The Langmuir adsorption isotherm is given by kp/(1+kp), where P is the pressure of the adsorabate gas. The Langmuir adsorption isotherm for… · DEC 2011self-practice
ABC26PH0564 · The process given below follows the Langmuir adsorption isotherm A2(g) k-1k1 2 Aads · 2005-2021
ABC26PH0565 · Adsorption of CO on charcoal at 273 K follows Langmuir isotherm. A plot of P(kPa) / V (cm3 ) versus P(kPa) is linear with a slope of 0.01 y… · 2005-2021self-practice
ABC26PH0566 · The dissociative chemisorption of X2(g) one a metal surface follows langmuir adsorption isotherm. The ratio of the rate constants of the… · 2005-2021self-practice
ABC26PH0567 · For low partial pressure of ozone (O3 ), the adsorption of ozone on graphite surface is the fully dissociative in nature and follows… · 2005-2021self-practice
ABC26PH1419 · The adsorption of a gas is described by the Langmuir isotherm with the equilibrium constant K =0.9\,kPa-1 at 25°C. The pressure (in kPa) at… · JUNE 2012
ABC26PH1425 · For the non dissociative Langmuir type adsorption of a gas on a solid surface at a particular temperature, the fraction of surface coverage… · JUNE 2014
ABC26PH1436 · The figure below depicts an adsorption isotherm of O2, on charcoal at 90 K .At a pressure 25 torr, only 10 \% of charcoal sites are… · JUNE 2017
ABC26PH1441 · A gas is known to satisfy Langmuir isotherm when adsorbed on a certain metal surface. If the fractional coverage of the gas is 0.5 when the… · DEC 2019
ABC26PH1444 · In a Langmuir-type adsorption, a solid adsorbs 0.25 mg of a gas when the pressure of the gas is 50 bar and 0.2 mg of the gas at 20 bar… · JUNE 2021
Catalysis Surface
ABC26PH0219 · The order of a surface catalyzed unimolecular reaction, at very low and very high pressures of the reactant, would be, respectively · DEC 2019
ABC26PH1439 · The order of a surface catalyzed unimolecular reaction, at very low and very high pressures of the reactant, would be, respectively · DEC 2019
ABC26PH1440 · The correct statement about chemisorption is · DEC 2019
Colloids Micelles
ABC26PH1416 · Dispersion of a solid in a liquid, a liquid in a gas and a liquid in a liquid are respectively known as · JUNE 2012
ABC26PH1420 · The aggregation of surfactant molecules is known as · JUNE 2013
ABC26PH1423 · Michael Faraday observed that the colour of colloidal suspensions of gold nanoparticles changes with the size of the nano particles. This… · DEC 2013
ABC26PH0216 · Energy of interaction of colloidal particles as a function of distance of separation can be identified as (1) vander Waals, (2) double… · JUNE 2015self-practice
ABC26PH1428 · Energy of interaction of colloidal particles as a function of distance of separation can be identified as (1) Vander Waals, (2) double… · JUNE 2015
ABC26PH1434 · When river water containing colloidal clay flows into the sea, the major cause of silting is · JUNE 2016
ABC26PH1435 · An intense purple colour (Plasmon band) is exhibited by a colloid consisting of spherical · JUNE 2017
ABC26PH1437 · Above the critical micelle concentration (CMC), the option which correctly describes the variation of molar conductivity with increase in… · JUNE 2019
Surface Chemistry – General
ABC26PH0560 · Physisorbed particles undergo desorption at 27°C with an activation energy of 16.628 kJ mol-1. Assuming first order process and a frequency… · 2005-2021
ABC26PH0561 · According to conventional transition state theory, for elementary bimolecular reactions, the molar entropy of activation Delta S0 is: · 2005-2021
ABC26PH0211 · Flocculation value of K2SO4 is much less than that of KBr for Sol A. Floccultion value of CaCl2 is much less than that of NaCl for Sol B… · DEC 2011
ABC26PH1414 · Flocculation value of K2 SO4 is much less than that of KBr for Sol A . Floccultion value of CaCl2 is much less than that of NaCl for Sol B… · DEC 2011
ABC26PH1417 · A dilute silver nitrate solution is added to a slight excess iodide solution. A solution of AgI is formed whose surface adsorbs. · JUNE 2012
ABC26PH1422 · The volume of a gas adsorbed on a solid surface is 10.0 mL, 11.0 mL, 11.2 mL, 14.5 mL and · DEC 2013self-practice
ABC26PH1424 · The molecule that has the smallest diffusion coefficient in water is · DEC 2013
ABC26PH1426 · Hydrogen is adsorbed on many metal surfaces by dissociation (S represents a surface site)- If the pressure of H2(p) is small, the fraction… · DEC 2011
ABC26PH0215 · For a reaction on a surface At low pressure of H, the rate is proportional to · JUNE 2015self-practice
ABC26PH1427 · For a reaction on a surface At low pressure of H, the rate is proportional to · JUNE 2015
ABC26PH1429 · Stability of lyophobic dispersions is determined by · DEC 2015
ABC26PH1430 · Adsorbtion isotherm of three gases A, B, C are shown in the following figure, where theta is the percentage of surface coverage. The… · JUNE 2016
ABC26PH1431 · When 1 10-5 g of a fatty acid (M=602.3 g/mol) was placed on water as a surface film, a monomolecular layer of area 100\,cm2 was formed on… · DEC 2016
ABC26PH1432 · Mark-Houwink equation ( [n]=KMa ) is used for the determination of · DEC 2016
ABC26PH0217 · The volume of a gas adsorbed on a solid surface is 10.0 mL, 11.0 mL, 11.2 mL, 14.5 mL and 22.5 mL at 1.0, 2.0, 3.0, 4.0 and 5.0 atm… · DEC 2016
ABC26PH1433 · 22.5 mL at 1.0, 2.0, 3.0, 4.0 and 5.0 atm. pressure, respectively. These data are best represented by · DEC 2016
ABC26PH0220 · Saturation factor in neutron activation analysis is (A= induced radioactivity, = neutron flux, sigma = effective nuclear cross section, N =… · DEC 2016
ABC26PH1443 · The volume of nitrogen gas adsorbed at STP to form a monolayer on a porous solid surface is · JUNE 2021self-practice
ABC26PH0221 · In fission of 235 U atom the energy released is 200 MeV . In one day fission of 1 kg235 U will give power (in MW) approximately · JUNE 2018
ABC26PH0222 · the amount of energy (in kJ/mol) released during this process is (given: U=235.0439 amu, Ba=141.9164 amu, 91Kr=90.9234 amu, neutron… · JUNE 2011self-practice
Surface Tension
ABC26PH0214 · "Colloids are thermodynamically unstable with reference to bulk but kinetically stable". Identify the correct pair · JUNE 2013