List of top Physical Chemistry Questions on Thermodynamics asked in IIT JAM CY

Identify the reaction for which, at equilibrium, a change in the volume of the closed reaction vessel at a constant temperature will not affect the extent of the reaction

The enthalpy change for the reaction
C(𝑔) +$\frac{1}{2}$ O₂(𝑔)→CO(𝑔) is _______ kJ per mole of CO(𝑔) produced. 
(rounded off to one decimal place) 
[Given: 
C(𝑔)+O₂(𝑔) → CO₂(𝑔), ΔH_rxn = −393.5 kJ per mole of CO₂(𝑔) produced 
CO₂(𝑔) → CO(𝑔) +$\frac{1}{2}$ O₂(𝑔), ΔH_rxn = 283.0 kJ per mole of CO(𝑔) produced]

A system undergoes one clockwise cycle from point X back to point X as shown in the figure below:

The correct statement about this process is

In the Born-Haber cycle, the heat of formation of CuCl is ______ kJ/mol.
[Given: Heat of atomization of Cu = +338 kJ/mol, 
Ionization energy of Cu = +746 kJ/mol, 
Heat of atomization of Cl₂ = +121 kJ/mol, 
Electron affinity of Cl = −349 kJ/mol, and 
Lattice energy of CuCl = −973 kJ/mol] 
(round off to the nearest integer)

Consider the following reaction:
2 C₆H₆+15 O₂→12 CO₂+6 H₂O $Δ_r𝐻^0_{298}$ =−3120 kJ mol⁻¹.
A closed system initially contains 5 moles of benzene and 25 moles of oxygen under standard conditions at 298 K. The reaction was stopped when 17.5 moles of oxygen is left. The amount of heat evolved during the reaction is____kJ. 
(round off to the nearest integer)

The correct relation(s) for an ideal gas in a closed system is/are

The volume of 2.0 mol of an ideal gas is reduced to half isothermally at 300 K in a closed system. The value of ΔG is_____ kJ.
[Given: R=8.314 J mol^-1 K^-1 ] 
(round off to two decimal places)

The standard Gibbs free energy change for the reaction
$H_2O (g) → H_2 (g) + ½ O_2(g)$ at 2500 K is $+118 kJ mol^{-1}$
The equilibrium constant for the reaction is
[Given: $R= 8.314 J K^{-1} mol^{-1}$]

Among the following, the reaction(s) that favor(s) the formation of the products at 25 °C is/are

The reaction involve(s)

For an N-atom nonlinear polyatomic gas, the constant volume molar heat capacity Cv,m has the expected value of 3(N-1)R, based on the principle of equipartition of energy. The correct statement(s) about the measured value of Cv,m is/are

The conversion of $ICl$ to $ICl^+$ involve(s)

Iron is extracted from its ore via the reaction
$Fe_2O_3, + 3 CO→ 2 Fe + 3CO_2$
The volume of CO (at STP) required to produce 1 kg of iron is ________liters. (round off to the nearest integer)
[Given: Atomic wt. of Fe = 56; assume STP to be 0 °C and 1 atm]

At constant volume, 1.0 kJ of heat is transferred to 2 moles of an ideal gas at 1 atm and 298 K. The final temperature of the ideal gas is ____K. (round off to one decimal place)
[Given: R = 8.314 J K^-1 mol^-1]