jee_main_2025_03_april_evening - Thermodynamics Topics

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QUESTION #0 Thermodynamic Processes and First Law
An ideal gas exists in a state with pressure P_0, volume V_0. It is isothermally expanded to 4 times of its initial volume (V_0), then isobarically compressed to its original volume. Finally the system is heated isochorically to bring it to its initial state. The amount of heat exchanged in this process is :
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QUESTION #41 Latent Heat and Phase Equilibrium
Given below are two statements: Statement I: When a system containing ice in equilibrium with water (liquid) is heated, heat is absorbed by the system and there is no change in the temperature of the system until whole ice gets melted. Statement II: At melting point of ice, there is absorption of heat in order to overcome intermolecular forces of attraction within the molecules of water in ice and kinetic energy of molecules is not increased at melting point. In the light of the above statements, choose the correct answer from the options given below:
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QUESTION #47 Work Done in Reversible Cyclic Processes
A perfect gas (0.1mathrm~mol) having barC_v=1.50mathrm~R (independent of temperature) undergoes the transformation from point 1 to point 4 as shown in the pressure-volume diagram below. If each step is reversible, the total work done (w) while going from point 1 to point 4 is (-) ________ J. (nearest integer) {{IMG1}} [Given: R=0.082mathrm~L~atm~K^-1~mol^-1 = 8.314mathrm~J~K^-1~mol^-1]
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QUESTION #48 Bomb Calorimetry and Heat of Combustion
A sample of n-octane (1.14mathrm~g) was completely burnt in excess of oxygen in a bomb calorimeter, whose heat capacity is 5mathrm~kJ~K^-1. As a result of combustion reaction, the temperature of the calorimeter is increased by 5 K. The magnitude of the heat of combustion of octane at constant volume is ________ mathrmkJ~mol^-1. (nearest integer)
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