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 300 K and 2 atm to 600 K and 4 atm . The entropy change for this process is · JUNE 2019
ABC26PH1511 · One mole of a mono-atomic ideal gas is transformed from 300 K and 2 atm to 600 K and 4 atm . The entropy change for this process is · JUNE 2019
ABC26PH0250 · A non-ideal gas, follows the equation P=R TVm [1+BVm ] where B is a function of temperature only. The deviation in internal energy from… · JUNE 2019
ABC26PH1512 · A non-ideal gas, follows the equation P=R TVm [1+BVm ] where B is a function of temperature only. The deviation in internal energy from… · 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
ABC26PH0252 · Consider the entropy changes in a system undergoing transformation, as depicted in the diagram, below arrayc 25 Delta S1 50 Delta S2 75 \\… · DEC 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 -R 2. The experimentally observed change in entropy upon mixing 1.0 mol of… · DEC 2019
ABC26PH1522 · The excess molar entropy of mixing of liquid A with liquid B is -R 2. The experimentally observed change in entropy upon mixing 1.0 mol of… · 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
Partial Molar Quantities
ABC26PH1447 · The chemical potential of component 1 in a solution of binary mixture is 1=10+RT p1, when p1 is the partial pressure of component 1 vapour… · JUNE 2011
ABC26PH0576 · The expression which represents the chemical potential of the i^ th sp species ( ) in a mixture (i j) is · 2005-2021self-practice
ABC26PH0232 · The chemical potential ( ) of the i^ th component is defined as · DEC 2013
ABC26PH1466 · The chemical potential ( ) of the i^ th 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 () as · JUNE 2019
ABC26PH1515 · The chemical potential ( mu ) of a 2 molar Na2 SO4 solution is expressed in terms of mean ionic activity co-efficient ( ) 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
ABC26PH1517 · 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
ABC26PH1523 · The change in chemical potential (in J ) of one mole of an ideal gas, when it is compressed isothermally at 300 K from 1.0 atm to 2.0 atm… · DEC 2019
Phase Equilibria
ABC26PH1488 · Phase diagram of a compound is shown below The slopes of the lines OA, AC and AB are ( pi )/4, ( pi )/6 and ( pi )/3 respectively. If… · JUNE 2016
ABC26PH1492 · Triple point pressure of substances A, B, C and D are 0.2,0.5,0.8 and 1.2 bar, respectively. The substance which sublimes under standard… · DEC 2016
ABC26PH1496 · A one-component system with the associated phase diagram (see the figure) is not possible because · JUNE 2017
Thermochemistry
ABC26PH0578 · The specific volume of liquid water is 1.001 mL g-1 and that of ice is 1.0907 mL g-1 at C. If the heat of fusion of ice at this temperature… · 2005-2021
Thermodynamics – General
ABC26PH0223 · arrayl1.1 2.2 3.3 4.4array · JUNE 2011
ABC26PH0569 · In an adiabatic system, the work done to change its state from A to B is · 2005-2021self-practice
ABC26PH0570 · The internal pressure, =T (( P)/( T) )V-P for one mole a Vander waals gas is · 2005-2021self-practice
ABC26PH1448 · For a system of constant composition, the pressure (P) is given by. · DEC 2011
ABC26PH0572 · The plot that describes a Carnot cycle is: · 2005-2021self-practice
ABC26PH1449 · For the reaction C2 H4(g)+3 O2(g) 2 CO2(g)+2 H2 O(l), the value of Delta H- Delta U (in kJ ) at 300 K and 1bar is · DEC 2011
ABC26PH0573 · Delta S_ univ 0 for the following reaction, at 298 K is: N2+3 H2 2 NH3 Delta Ssys0=-197 JK-1, Delta Hsys0=-91.8 kJ · 2005-2021self-practice
ABC26PH0574 · The work done (in atm-L) on the gas in the process is · 2005-2021self-practice
ABC26PH0227 · For the reaction H2 O(g)+C (graphite) CO(g)+H2 O(g), the variation of energy parameter Delta G0, Delta H0 and T Delta S0 of the reaction… · DEC 2011
ABC26PH1452 · For the reaction H2 O(g)+C (graphite) CO(g)+H2 O(g), the variation of energy parameter Delta G0, Delta H0 and T Delta S0 of the reaction… · DEC 2011
ABC26PH0228 · The vapour of a pure substance, when cooled under a pressure less than its triple-piont pressure, · JUNE 2012self-practice
ABC26PH1453 · The vapour of a pure substance, when cooled under a pressure less than its triple-point pressure, · JUNE 2012
ABC26PH1454 · The quantities, which are held fixed in a canonical ensemble are · JUNE 2012
ABC26PH1455 · An ideal gas was subjected to a reversible, adiabatic, expansion and then its initial volume was restored by a reversible, isothermal… · JUNE 2012
ABC26PH0230 · A carnot takes up 90 J of heat from the source kept at 300K. The correct statement among the following is · DEC 2012
ABC26PH1457 · A carnot takes up 90 J of heat from the source kept at 300 K . The correct statement among the following is · DEC 2012
ABC26PH0582 · If a gas obeys the equation of state P(V-nb)=nRT, the ratio (CP-CV ) (CP-Cv )_ ideal is: · 2005-2021
ABC26PH1458 · The fugacity of a gas depends on pressure and the compressibility factor Z(=p V / RT) through the relation ( V is the molar volume). For… · DEC 2012
ABC26PH0231 · The internal pressure ( U / V)T of a real gas is related to the compressibility factor Z=p V / RT by [ where, V is the molar volume] · DEC 2012self-practice
ABC26PH0583 · Among the following the system that would require the least amount of thermal energy to bring its temperature to 80°C. · 2005-2021self-practice