Thermodynamics: JEE Main Chemistry Previous Year Questions

511 previous year questions from Thermodynamics. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. $Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following:$
2. $The species which by definition has ZERO standard molar enthalpy of formation at 298 K is :$
3. $Given that C + O_{2} \to C O_{2}, Δ H^{o} = - xkJ 2 CO + O_{2} \to 2 C O_{2}, Δ H^{o} = - ykJ The enthalpy of formation of ca\dots$
4. $Which of the following statements is correct for the spontaneous adsorption of a gas?$
5. $Match List-I with List-II (matching question)$
6. $For the reaction H_{2} F_{2} (g) \to H_{2} (g) + F_{2} (g) ∆ U = -59.6 kJ m o l^{- 1} at 27°C. The enthalpy change for the above reaction is (-) ___kJ m o l^{- 1} [neare\dots$
7. $The molar heat capacity for an ideal gas at constant pressure is 20.785 J K^{- 1} m o l^{- 1} . The change in internal energy is 5000 J upon heating it from 300K to 500K. The\dots$
8. $A vessel contains 100 liters of a liquid X. Heat is supplied to the liquid in such a fashion that, Heat given = change in enthalpy. The volume of the liquid increases by\dots$
9. $For a reaction A + B \to products, Δ H is - 84.2 kJ and Δ S is - 200 J K^{- 1} . Calculate the highest value of temperature\dots$
10. $For which of the following systems, the difference between Δ H and Δ U is not significant? (i) Solids (ii) gases (iii) Mixture of gases and liquids (iv) L\dots$
11. $Calculate the PV type of work for the following reaction at 1 bar pressure.\dots$
12. $Enthalpy change for the reaction, 4 H_{(g)} \to 2 H_{2 (g)} is - 869.6 kJ The dissociation energy of H - H bond is$
13. $For vaporization of water at 1 atmospheric pressure, the values of Δ H and Δ S are 40.63 kJmo l^{- 1} and 108.8 J K^{- 1} mo l^{- 1}, r\dots$
14. $For which among the following reactions, change in entropy is less than zero?$
15. $A certain engine which operates in a carnot cycle absorbs 3.347 kJ at 400ºC, how much work is done by the engine per cycle ? The temperature of sink is 100ºC.$
16. $Which among the following colligative properties is useful to determine molar masses of very expensive solutes?$
17. $Calculate the entropy change (\frac{J}{mol} K) of the given reaction. The molar entropies [J/K-mol] are given in brackets after each substance.\dots$
18. $Enthalpy of sublimation of iodine is 24 cal g^{- 1} at 200° C . If specific heat of I_{2} (s) and I_{2} (vap) are\dots$
19. $Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas? (Assume non-expansion wo\dots$
20. $Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is (Given that 1 L bar\dots$
21. $For a reversible spontaneous change Δ S is$
22. $The reaction, MgO(s) + C(s) \to Mg(s) + CO(g), for which D_{r} H° = +491.1 kJ m o l^{-1} and D_{r} S° = 198.0 J K^{-1} m o l^{-1}, is not feasible at 298 K. Temperature\dots$
23. $If Δ H is the change in enthalpy and Δ E, the change in internal energy accompanying a gaseous reaction, then$
24. $When 5litres of a gas mixture of methane and propane is perfectly combusted at 0^{o} C and 1 atmosphere, 16 litres of oxygen at the same temperature and pressure is c\dots$
25. $From the following bond energies: H—H bond energy: 431.37 kJ mol^{- 1} C=C bond energy: 606.10 kJ mol^{- 1} C—C bond energy: 336.49 kJ mol^{- 1} C—H bond energy: 410.5\dots$

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Thermodynamics: JEE Main Chemistry Previous Year Questions

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