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
ABC26PH1461 · A system consists of gaseous H2, O2, H2 O and CO2 where the amount of CO2 is specified and the equilibrium constant for the reaction 2… · JUNE 2013
ABC26PH0597 · Consider the reaction: A+B C The unit of the thermodynamic equilibrium constant for the reaction is · 2005-2021
ABC26PH0605 · At 1 bar and 298 K , for the process A(s) A(), the Delta G is 200 J mol-1 and Delta Vm is -2 10-6 m3 mol-1. The minimum pressure, in bar… · 2005-2021self-practice
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… · 2005-2021self-practice
ABC26PH0609 · The Gibbs free energy of mixing is denoted as Delta G_ max . 1.0 mole of He, 3.0 moles of Ne and 2.0 moles of Ar are mixed at the same… · 2005-2021self-practice
ABC26PH0239 · The non-spontaneous process among the following is · DEC 2015
ABC26PH1485 · The non-spontaneous process among the following is · DEC 2015
ABC26PH0614 · Consider the following equilibrium SO2(g)+1/2 O2 SO3(g) At 298 K , the standard molar Gibbs energies of formation, Go, of SO2(g) and SO3(g)… · 2005-2021self-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
Laws State Functions
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 CO 2,1 mol of N 2 and 2 mol of O 2 were mixed at 300 K . The entropy of mixing is · DEC 2011
ABC26PH0226 · For the liquid vapour equilibrium of a substance d P/d T at 1 bar and 400 K is 8 10-3 bar K-1. If the molar volume in the vapour form is… · DEC 2011
ABC26PH1451 · 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 Cp… · 2005-2021self-practice
ABC26PH0579 · The entropy of mixing of 10 moles of 10 moles of helium and 10 moles of oxygen at constant temperature and pressure, assuming both to be… · 2005-2021self-practice
ABC26PH0229 · For water, Delta H_ vap 41 kJ mol-1. The molar entropy of vaporization at 1 atm pressure is approximately · DEC 2012
ABC26PH1456 · For water, Delta H_ vap 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 N2 O in its crystalline state is 5.8 JK-1 mol-1 at absolute zero. The number of… · 2005-2021self-practice
ABC26PH0584 · Among the following, the reaction that is accompanied by a decrease in the entropy is · 2005-2021self-practice
ABC26PH0585 · Given that the standard molar enthapies of formation of NO(g) and NO2(g) are, respectively, 90.3 kJ mol-1 and · 2005-2021self-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) · 2005-2021self-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
ABC26PH0595 · The change in enthalpy when 3 mol of liquid benzene transforms to the vapour state at its boiling temperature (80 C ) and at 1 bar pressure… · 2005-2021self-practice
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 d f of a state function f(x, y), among the following is · DEC 2014self-practice
ABC26PH1474 · The exact differential df of a state function f(x, y), among the following is · DEC 2014
ABC26PH0601 · The internal energy of an ideal gas follows the equation U=3.5 PV+k, where k is a constant. The gas expands from an initial volume of 0.25… · 2005-2021self-practice
ABC26PH0602 · One mole of a substance is heated from 300 K to 400 K at contant pressure. The Cp of the substance is given by, Cp (JK-1 mol-1 )=5+0.1 T… · 2005-2021self-practice
ABC26PH0603 · One mole of an ideal gas is comlpressed from 5 L to 2 L at constant temperature. The change in entropy, in JK-1, of the gas is ____… · 2005-2021self-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) - (( A)/( T)… · 2005-2021
ABC26PH1481 · If the pressure p (system) is greater than the p (surroundings), then · DEC 2015
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… · 2005-2021self-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… · 2005-2021self-practice
ABC26PH0611 · The molar heat capacity of a substance is represented in the temperature range 298 K to 400 K by the empirical relation Cp, m=14+nTJK-1… · 2005-2021self-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… · 2005-2021self-practice
ABC26PH0615 · When three moles of helium is mixed with one mole of neon at constant temperature and pressure (25°C, 1atm), the entropy of mixing (in… · 2005-2021self-practice
ABC26PH0620 · The change in enthalpy ( Delta H) for the reaction 2 P(s)+3 Br2(l) 2 PBr3(l) is -243 kJ . In this reaction, if the amount of phosphorus… · 2005-2021self-practice
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
ABC26PH0246 · In the phase diagram of water, the solid-liquidboundary has a negative slope. The reason for this unusual behavior can be traced to… · JUNE 2018