jee_main_2026_21_jan_morning - Thermodynamics Topics

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QUESTION #49 Internal Energy
10 mole of oxygen is heated at constant volume from 30^circtextC to 40^circtextC. The change in the internal energy of the gas is ____ cal. (The molecular specific heat of oxygen at constant pressure, C_p = 7text cal./mol ^circtextC and R = 2text cal./mol ^circtextC.)
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QUESTION #68 Work Done in PV Graph
Which of the following graphs between pressure ‘P’ versus volume ‘V’ represent the maximum work done?
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QUESTION #69 Gibbs Free Energy and Equilibrium
For the reaction, N_2O_4 rightleftharpoons 2NO_2, graph is plotted as shown below. Identify correct statements. A. Standard free energy change for the reaction is -5.40text kJ mol^-1. B. As Delta G^ominus in graph is positive, N_2O_4 will not dissociate into NO_2 at all. C. Reverse reaction will go to completion. D. When 1 mole of N_2O_4 changes into equilibrium mixture, value of Delta G = -0.84text kJ mol^-1. E. When 2 mole of NO_2 changes into equilibrium mixture, Delta G for equilibrium mixture is -6.24text kJ mol^-1. {{IMG1}} Choose the correct answer from the options given below :
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QUESTION #73 Gibbs Free Energy and Equilibrium Constant
Use the following data :
SubstancefracDelta_f H^ominus(500K)kJ mol^-1fracS^ominus(500K)J K^-1 mol^-1
AB(g)32222
A_2(g)6146
B_2(g)x280
One mole each of A_2(g) and B_2(g) are taken in a 1L closed flask and allowed to establish the equilibrium at 500K. A_2(g) + B_2(g) rightleftharpoons 2AB(g) The value of x (in textkJ mol^-1) is .... (Nearest integer) (Given: log K=2.2, R=8.314text J K^-1text mol^-1)
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