Surface Chemistry

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… · 2005-2021 self-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

ABC26PH0567 · For low partial pressure of ozone (O3), the adsorption of ozone on graphite surface is the fully dissociative in nature and follows… · 2005-2021 self-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

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

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

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

ABC26PH0213 · The aggregation of surfactant molecules is known as · JUNE 2013

ABC26PH1420 · The aggregation of surfactant molecules is known as · JUNE 2013

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

ABC26PH0560 · Physisorbed particles undergo desorption at 27^ 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

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

ABC26PH0484 · In Freundlich isotherm, a linear relationship is obtained in the plot of (theta = surface coverage and p = partial pressure of the gas) · 2005-2021

ABC26PH0485 · Adsorption of N2 on TiO2 was carried out at 75 K. A plot of z/((1-z)V) versus z (z = p/p0) gives a straight line with an intercept, 4.0 ×… · 2005-2021 self-practice

ABC26PH1424 · The molecule that has the smallest diffusion coefficient in water is · DEC 2013

ABC26PH0215 · For a reaction on a surface H2 + + H At low pressure of H, the rate is proportional to · JUNE 2015 self-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

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

ABC26PH0220 · Saturation factor in neutron activation analysis is (A= induced radioactivity, psi = neutron flux, sigma = effective nuclear cross section… · DEC 2016

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

ABC26PH0214 · "Colloids are thermodynamically unstable with reference to bulk but kinetically stable". Identify the correct pair · JUNE 2013

ABC26PH1421 · "Colloids are thermodynamically unstable with reference to bulk but kinetically stable". Identify the correct pair · JUNE 2013

ABC26PH0218 · A liquid of density 1.1 g cm-3 climbs to a height of 5.0 cm when a capillary with internal radius of 0.2 mm is dipped into it. The surface… · DEC 2019 self-practice

ABC26PH1438 · A liquid of density 1.1 g cm-3 climbs to a height of 5.0 cm when a capillary with internal radius of 0.2 mm is dipped into it. The surface… · DEC 2019

ABC26PH1442 · The surface tension of dilute soap solution is lower than that of pure water because · DEC 2019

ABC26PH1445 · Liquid A has half the surface tension and twice the density of liquid B at 30°C. The contact angles of A and B are the same. If A rises 10… · JUNE 2021