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Thermodynamics

81 questions · Chemistry · NEET
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Thermodynamics

81 questions · Chemistry · NEET

  1. The standard heat of formation, in kcal/mol of Ba2+ is : [Given : standard heat of formation of SO42−​ ion (aq)=−216kcal/mol, standard heat of…2025 · Q107 · MCQ
  2. C(s)+2H2​( g)→CH4​( g);ΔH=−74.8 kJ mol−1. Which of the following diagrams gives an accurate representation of the above reaction?…2025 · Q109 · MCQ
  3. In which of the following processes entropy increases? A. A liquid evaporates to vapour. B. Temperature of a crystalline solid lowered from 130 K to 0 K. C. 2NaHCO3( s)​→Na2​CO3( s)​+CO2( g)​+H2​O(g)​…2024 · Q119 · MCQ
  4. Match List I with List II. Choose the correct answer from the options given below: Includes table2024 · Q131 · MCQ
  5. The work done during reversible isothermal expansion of one mole of hydrogen gas at 25∘C from pressure of 20 atmosphere to 10 atmosphere is (Given R=2.0 cal K−1 mol−1)2024 · Q148 · MCQ
  6. Choose the correct statement for the work done in the expansion and heat absorbed or released when 5 litres of an ideal gas at 10 atmospheric pressure isothermally expands into vacuum until volume is 15 litres :2024 · Q114 · MCQ
  7. For an endothermic reaction: (A) qp​ is negative. (B) Δr​H is positive. (C) Δr​H is negative. (D) qp​ is positive. Choose the correct answer…2024 · Q129 · MCQ
  8. For the following reaction at 300 K A2​( g)+3 B2​( g)→2AB3​( g) the enthalpy change is +15 kJ, then the internal energy change is :2024 · Q146 · MCQ
  9. Consider the following reaction :- 2H2​( g)+O2​( g)→2H2​O(g)Δr​H∘=−483.64 kJ.  What is the enthalpy…2023 · Q122 · MCQ
  10. The equilibrium concentrations of the species in the reaction A+B⇌C+D are 2,3,10 and 6 mol L−1, respectively at 300 K.ΔG0…2023 · Q115 · MCQ
  11. Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?2023 · Q116 · MCQ
  12. One mole of an ideal gas at 300 K is expanded isothermally from 1 L to 10 L volume. ΔU for this process is : (Use R = 8.314 J k−1 mol−1)2022 · Q106 · MCQ
  13. A vessel contains 3.2 g of dioxygen gas at STP (273.15 K and 1 atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes one third of the original pressure. The volume of new vessel in L is…2022 · Q128 · MCQ
  14. Which of the following p-V curve represents maximum work done?2022 · Q89 · MCQ
  15. For irreversible expansion of an ideal gas under isothermal condition, the correct option is :2021 · Q121 · MCQ
  16. Which one among the following is the correct option for right relationship between CP and CV for one mole of ideal gas?2021 · Q94 · MCQ
  17. The correct option for free expansion of an ideal gas under adiabatic condition is :2020 · Q109 · MCQ
  18. Hydrolysis of sucrose is given by the following reaction. Sucrose + H2O ⇌ Glucose + Fructose If the equilibrium constant (Kc) is 2 × 1013 at 800 K, the value of ΔrGΘ at the same temperature will be :2020 · Q81 · MCQ
  19. For the reaction, 2Cl(g) → Cl2(g), the correct option is :2020 · Q87 · MCQ
  20. In which case change in entropy is negative?2019 · Q107 · MCQ
  21. 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 = 100 J]2019 · Q99 · MCQ
  22. The bond dissociation energies of X2 , Y2 and XY are in the ratio of 1 : 0.5 : 1. ΔH for the formation of XY is –200 kJ mol–1. The bond dissociation energy of X2 will be2018 · Q104 · MCQ
  23. For a given reaction, ΔH = 35.5 kJ mol−1 and ΔS = 83.6 J K−1 mol−1. The reaction is spontaneous at (Assume that ΔH and ΔS do not vary with temperature.)2017 · Q108 · MCQ
  24. A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy ΔU of the gas in joules will be2017 · Q109 · MCQ
  25. The correct thermodynamic conditions for the spontaneous reaction at all temperatures is2016 · Q105 · Multiple correct
  26. For a sample of perfect gas when its pressure is changed isothermally from pi to pf, the entropy change is given by2016 · Q107 · MCQ
  27. The heat of combination of carbon to CO2 is −393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is2015 · Q97 · MCQ
  28. Which of the following statements is correct for the spontaneous adsorption of a gas?2014 · Q108 · MCQ
  29. For the reaction, X2​O4(l)​→2XO2(g)​ ΔU = 2.1 kcal, ΔS = 20 cal K−1 at 300 K Hence, G is2014 · Q98 · MCQ
  30. When 5 litres of a gas mixture of methane and propane is perfectly combusted at 0oC and 1 atmosphere, 16 litres of oxygen at the same temperature and pressure is consumed, The amount of heat released from this combustion in kJ ($\Delta…2013 · Q110 · MCQ
  31. Three thermochemical equations are given below (i) C(graphite) + O2(g) → CO2(g); ΔrHo = x kJ mol−1 (ii) C(graphite) + 21​O2(g) → CO(g); ΔrHo = y kJ mol−1 (iii) CO(g) + 21​O2(g) →…2013 · Q111 · MCQ
  32. A reaction having equal energies of activation for forward and reverse reactions has2013 · Q110 · MCQ
  33. In which of the following reactions, standard reaction entropy change (ΔSo) is positive and standard Gibb's energy change (ΔGo) decreases sharply with increasing temperature ?2012 · Q117 · MCQ
  34. Standard enthalpy of vaporisation ΔvapHo for water at 100oC is 40.66 kJ mol−1. The internal energy of vaporisation of water at 100oC (in kJ mol−1) is2012 · Q118 · MCQ
  35. The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0oC is2012 · Q119 · MCQ
  36. Consider the following processes : For B + D → E + 2C, ΔH will be Includes table2011 · Q77 · MCQ
  37. If the enthalpy change for the transition of liquid water to steam is 30 kJ mol−1 at 27oC, the entropy change for the process would be2011 · Q113 · MCQ
  38. Enthalpy change for the reaction, 4H(g) → 2H2(g) is −869.6 kJ The dissociation energy of H − H bond is2011 · Q114 · MCQ
  39. Which of the following is correct option for free expansion of an ideal gas under adiabatic condition ?2011 · Q115 · MCQ
  40. The following two reactions are known Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g); ΔH = − 26.8 kJ FeO(s) + CO(g) → Fe(s) + CO2(g); ΔH = − 16.5 kJ The value of ΔH for the following reaction Fe2O3(s) + CO(g) →…2010 · Q66 · MCQ
  41. For vaporization of water at 1 atmospheric pressure, the values of ΔH and ΔS are 40.63 kJ mol−1 and 108.8 J K−1 mol−1, respectively. The temperature when Gibb's energy change (ΔG) for this transformation will…2010 · Q67 · MCQ
  42. Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be2010 · Q68 · MCQ
  43. Match List I (Equations) with List II (Type of processes) and select the correct option. Includes table2010 · Q69 · MCQ
  44. For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is ΔH (both of these in kJ/mol). Minimum value of Ea will be2010 · Q124 · MCQ
  45. Standard entropies of X2, Y2 and XY3 are 60, 40 and 50 J K−1 mol−1 respectively. For the reaction 1/2X2 + 3/2Y2 ⇌ XY3, ΔH = − 30 kJ, to be at equilibrium, the temperature should be2010 · Q125 · MCQ
  46. The values of ΔH and ΔS for the reaction, C(graphite) + CO2(g) → 2CO(g) are 170 kJ and 170 J K−1, respectively. This reaction will be spontaneous at2009 · Q116 · MCQ
  47. 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 : 410.50 kJ mol−1 Enthalpy for the reaction, will be Includes diagram2009 · Q117 · MCQ
  48. For the gas phase reaction, PCl5(g) ⇌ PCl3(g) + Cl2(g) which of the following conditions are correct ?2008 · Q104 · MCQ
  49. Which of the following are not state functions ? (I) q + w (II) q (III) w (IV) H − TS2008 · Q112 · MCQ
  50. Bond dissociation enthalpy of H2, Cl2 and HCl are 434, 242 and 431 kJ mol−1 respectively. Enthalpy of formation of HCl is2008 · Q113 · MCQ
  51. Consider the following reactions : (i) H+(aq) + OH−(aq) = H2O(l), ΔH = − X1 kJ mol−1 (ii) H2(g) + 1/2O2(g) = H2O(l), ΔH = − X2 kJ mol−1 (iii) CO2(g) + H2(g) = CO(g) + H2O(l), ΔH = − X3 kJ mol−1 (iv)…2007 · Q91 · MCQ
  52. Given that bond energies of H − H and Cl − Cl are 430 kJ mol−1 and 240 kJ mol−1 respectively and ΔHf for HCl is − 90 kJ mol−1, bond enthalpy of HCl is2007 · Q99 · MCQ
  53. Identify the correct statement for change of Gibb's energy for a system (ΔGsystem) at constant temperature and pressure.2006 · Q115 · MCQ
  54. The enthalpy and entropy change for the reaction: Br2(l) + Cl2(g) → 2BrCl(g) are 30 kJ mol−1 and 105 J K−1 mol−1 respectively. The temperature at which the reaction will be in equilibrium is2006 · Q116 · MCQ
  55. The enthalpy of hydrogenation of cyclohexene is is − 119.5 kJ mol−1. If resonance energy of benzene is − 150.4 kJ mol−1, its enthalpy of hydrogenation would be2006 · Q117 · MCQ
  56. Assume each reaction is carried out in an open container. For which reaction will ΔH = ΔE ?2006 · Q118 · MCQ
  57. Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction ?2005 · Q111 · MCQ
  58. A reaction occurs spontaneously if2005 · Q112 · MCQ
  59. The absolute enthalpy of neutralisation of the reaction : Mg(O)(s) + 2HCl(aq) → MgCl2(aq) + H2O(l) will be2005 · Q113 · MCQ
  60. If the bond energies of H − H, Br − Br, and H − Br are 433, 192 and 364 kJ mol−1 respectively, the ΔHo for the reaction H2(g) + Br2(g) → 2HBr(g) is2004 · Q106 · MCQ
  61. Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are − 382.64 kJ mol−1 and − 145.6 kJ mol−1, respectively. Standard Gibb's energy change for the same reaction at 298 K is2004 · Q107 · MCQ
  62. Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is2004 · Q108 · MCQ
  63. The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm is (1 L atm = 101.32 J)2004 · Q98 · MCQ
  64. For the reaction, C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l) at constant temperature, ΔH − ΔE is2003 · Q113 · MCQ
  65. The densities of graphite and diamond at 298 K are 2.25 and 3.31 g cm−3, respectively. If the standard free energy difference (ΔGo) is equal to 1895 J mol−1, the pressure at which graphite will be…2003 · Q114 · MCQ
  66. Formation of solution from two components can be considered as (i) Pure solvent → separated solvent molecules, ΔH1 (ii) Pure solute → separated solute molecules, ΔH2 (iii) Separated solvent and solute molecules →…2003 · Q115 · MCQ
  67. What is the entropy change (in J K−1 mol−1) when one mole of ice is converted into water at 0oC? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol−1 at 0oC).2003 · Q116 · MCQ
  68. For which one of the following equations is ΔHoreact equal to ΔHof for the product ?2003 · Q117 · MCQ
  69. The molar heat capacity of water at constant pressure, C, is 75 J K−1 mol−1. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is2003 · Q118 · MCQ
  70. Unit of entropy is2002 · Q113 · MCQ
  71. Which reaction is not feasible?2002 · Q114 · MCQ
  72. In a closed insulated container a liquid is stirred with a paddle to increase the temperature which of the following is true ?2002 · Q115 · MCQ
  73. Heat of combustion ΔHo for C(s), H2(g) and CH4(g) are − 94, − 68 and −213 kcal/mol, then ΔHo for C(s) + 2H2(g) → CH4(g) is2002 · Q116 · MCQ
  74. 2 mole of ideal gas at 27oC temperature is expanded reversibly from 2 lit. to 20 lit. Find entropy change. (R = 2 cal/mol K)2002 · Q117 · MCQ
  75. PbO2 → PbO; ΔG298 < 0 SnO2 → SnO; ΔG298 > 0 Most probable oxidation state of Pb and Sn will be2001 · Q105 · MCQ
  76. Change in enthalpy for reaction, 2H2O2(l) → 2H2O(l) + O2(g) if heat of formation of H2O2(l) and H2O(l) are −188 and - 286 kJ/mol respectively, is2001 · Q115 · MCQ
  77. When 1 mol of gas is heated at constant volume temperature is raised from 298 to 308 K. Heat supplied to the gas is 500 J. Then which statement is correct ?2001 · Q116 · MCQ
  78. Enthalpy of CH4 + 21​ O2 → CH3OH is negative. If enthalpy of combustion of CH4 and CH3OH are x and y respectively. Then which relation is correct?2001 · Q117 · MCQ
  79. 2Zn + O2 → 2ZnO; ΔGo = − 616 J 2Zn + S2 → 2ZnS; ΔGo = − 293 J S2 + 2O2 → 2SO2; ΔGo = −408 J ΔGo for the following reaction 2ZnS + 3O2 → 2ZnO + 2SO2 is2000 · Q103 · MCQ
  80. The entropy change in the fusion of one mole of a solid melting at 27oC (latent heat of fusion is 2930 J mol–1) is :2000 · Q113 · MCQ
  81. For the reaction, C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l) which one is true2000 · Q114 · MCQ