Thermodynamics

ABC26PH1446 · A process is carried out at constant volume and at constant entropy. It will be spontaneous if: · JUNE 2011

ABC26PH0580 · The correct statement(s) among the following is/are (i) The vibrational energy levels of a real diatomic molecule are equally spaced. (ii)… · 2005-2021

ABC26PH0586 · The free energy change (Delta G) of 1 mole of an ideal gas that is compressed isothermally from 1 atm to 2 atm is: · 2005-2021

ABC26PH0597 · Consider the reaction: A + B ⇌ C The unit of the thermodynamic equilibrium constant for the reaction is · 2005-2021

ABC26PH0608 · The standard Gibbs free energy change of the reaction shown below is -2.7 kJ mol-1. Sn(s) + Pb2+ = Sn2+ + Pb(s) Given that E0(Pb2+/Pb) is… · 2005-2021 self-practice

ABC26PH1491 · The parameter which always decreases during a spontaneous process at constant S and V, is · DEC 2016

ABC26PH1513 · When two moles of liquid A are mixed with two moles of liquid B at 300 K, the excess molar Gibbs energy of the solution is -1.5 kJ mol-1… · JUNE 2019

ABC26PH0571 · Standard entropy of crystalline carbon monoxide (in J/mol) at 0 K is around · 2005-2021

ABC26PH0225 · 1 mol of CO2, 1 mol of N2 and 2 mol of O2 were mixed at 300 K. The entropy of mixing is · DEC 2011

ABC26PH1450 · 1 mol of CO2, 1 mol of N2 and 2 mol of O2 were mixed at 300 K. The entropy of mixing is · DEC 2011

ABC26PH0226 · For the liquid ⇌ vapour equilibrium of a substance dP/dT at 1 bar and 400 K is 8 × 10-3 bar K-1. If the molar volume in the vapour form is… · DEC 2011

ABC26PH0577 · The temperature of 54 g of water is raised from 15°C to 75°C at constant pressure. The change in the enthalpy of the system (given that… · 2005-2021 self-practice

ABC26PH0229 · For water, Delta Hvap ≈ 41 kJ mol-1. The molar entropy of vaporization at 1 atm pressure is approximately · DEC 2012

ABC26PH1456 · For water, Delta Hvap ≈ 41 kJ mol-1. The molar entropy of vaporization at 1 atm pressure is approximately · DEC 2012

ABC26PH0581 · The residual entropy of the asymmetric molecule N2O in its crystalline state is 5.8 J K-1 mol-1 at absolute zero. The number of… · 2005-2021 self-practice

ABC26PH0584 · Among the following, the reaction that is accompanied by a decrease in the entropy is · 2005-2021 self-practice

ABC26PH0587 · The molar entropy of crystalline CO at absolute zero is · 2005-2021

ABC26PH0589 · Among W (work), Q (heat), U (internal energy) and S (entropy) · 2005-2021 self-practice

ABC26PH0590 · The change in entropy when two moles of Argon gas are heated at constant volume from 300 K to 500 K is: · 2005-2021

ABC26PH1468 · The boiling point of a solution of non-volatile solid is higher than that of the pure solvent. It always indicates that · DEC 2013

ABC26PH0593 · For the process 1 Ar(300 K, 1 bar) → 1 Ar(200 K, 10 bar) assuming ideal gas behavior, the change in molar entropy is: · 2005-2021

ABC26PH1471 · In a bomb calorimeter, the combustion of 0.5 g of compound A (molar mass = 50 g mol-1) increased the temperature by 4 K. If the heat… · JUNE 2014

ABC26PH0236 · The exact differential df of a state function f(x, y), among the following is · DEC 2014 self-practice

ABC26PH0606 · For a system subjected to only P-V work, entropy is given by (I) - ((∂ G)/(∂ T))P (II) ((∂ G)/(∂ P))T (III) - ((∂ A)/(∂ V))T (IV) - ((∂… · 2005-2021

ABC26PH0607 · Consider an ideal gas of volume V at temperature T and pressure P. If the entropy of the gas is S, the partial derivative (∂ P/∂ S)V is… · 2005-2021 self-practice

ABC26PH0610 · Two moles of an ideal gas X and two moles of an ideal gas Y, initially at the same temperature and pressure, are mixed under… · 2005-2021 self-practice

ABC26PH0612 · The entropy change for the melting of 'x' moles of ice (heat of fusion is 80 cal g-1) at 273 K and 1 atm pressure is 28.80 cal K-1. The… · 2005-2021 self-practice

ABC26PH0615 · When three moles of helium is mixed with one mole of neon at constant temperature and pressure (25°C, 1 atm), the entropy of mixing (in… · 2005-2021 self-practice

ABC26PH0620 · The change in enthalpy (Delta H) for the reaction 2P(s) + 3Br2(l) → 2PBr3(l) is –243 kJ. In this reaction, if the amount of phosphorus… · 2005-2021 self-practice

ABC26PH0244 · Enthalpy is equal to · DEC 2017

ABC26PH1501 · Enthalpy is equal to · DEC 2017

ABC26PH0245 · The change in entropy for a reversible adiabatic process is · JUNE 2018

ABC26PH1504 · The change in entropy for a reversible adiabatic process is · JUNE 2018

ABC26PH1505 · In the phase diagram of water, the solid-liquid boundary has a negative slope. The reason for this unusual behavior can be traced to… · JUNE 2018

ABC26PH1509 · Consider a phase transition between two incompressible phases. The correct statement among the following is · DEC 2018

ABC26PH0248 · Entropy of a perfect gas is · DEC 2018

ABC26PH1510 · Entropy of a perfect gas is · DEC 2018

ABC26PH0249 · One mole of a mono-atomic ideal gas is transformed from 300K and 2 atm to 600K and 4 atm. The entropy change for this process is · JUNE 2019

ABC26PH1514 · A sample of 2.0 moles of O2(g) (assumed ideal) at 500 K is expanded from 5 L to 50 L under adiabatic and reversible conditions. The change… · JUNE 2019

ABC26PH1516 · Consider the entropy changes in a system undergoing transformation, as depicted in the diagram, below The correct statement among the… · DEC 2019

ABC26PH0256 · The excess molar entropy of mixing of liquid A with liquid B is -Rln 2. The experimentally observed change in entropy upon mixing 1.0 mol… · DEC 2019

ABC26PH1522 · The excess molar entropy of mixing of liquid A with liquid B is -Rln 2. The experimentally observed change in entropy upon mixing 1.0 mol… · DEC 2019

ABC26PH1525 · When yellow phosphorous is converted to red phosphorous, the entropy and volume of the system do not change. The order of this phase… · JUNE 2021

ABC26PH1447 · The chemical potential of component 1 in a solution of binary mixture is mu 1 = mu 10 + RTln p1, when p1 is the partial pressure of… · JUNE 2011

ABC26PH0232 · The chemical potential (mu i) of the ith component is defined as · DEC 2013

ABC26PH1466 · The chemical potential (mu i) of the ith component is defined as · DEC 2013

ABC26PH1479 · A thermodynamic equation that relates the chemical potential to the composition of a mixture is known as · JUNE 2015

ABC26PH0251 · The chemical potential (mu) of a 2 molar Na2SO4 solution is expressed in terms of mean ionic activity co-efficient (gamma _±) as · JUNE 2019

ABC26PH1515 · The chemical potential (mu) of a 2 molar Na2SO4 solution is expressed in terms of mean ionic activity co-efficient (gamma _±) as · JUNE 2019

ABC26PH0253 · Molar composition of a mixture of P and Q at equilibrium is 3:1 (P:Q). A small disturbance in composition results in change of chemical… · DEC 2019