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Thermodynamics

211 questions · Chemistry · JEE Main
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Thermodynamics

211 questions · Chemistry · JEE Main

  1. Two vessels A and B are connected via stopcock. The vessel A is filled with a gas at a certain pressure. The entire assembly is immersed in water and is allowed to come to thermal equilibrium with water. After opening the stopcock the gas… Includes diagram2025 · 2 Apr · Shift 1 · Q13 · MCQ
  2. Which of the following graphs correctly represents the variation of thermodynamic properties of Haber's process?2025 · 2 Apr · Shift 2 · Q11 · MCQ
  3. Arrange the following in order of magnitude of work done by the system/on the system at constant temperature. (a) ∣wreversible ​∣ for expansion in infinite stages. (b) ∣wirreversible ​∣ for…2025 · 2 Apr · Shift 2 · Q9 · MCQ
  4. Given : ​ΔH⊖sub ​[C (graphite )]=710 kJ mol−1ΔC−H​H⊖=414 kJ mol−1ΔH−H​H⊖=436 kJ mol−1ΔC​=CH⊖=611 kJ mol−1​…2025 · 3 Apr · Shift 1 · Q25 · Numerical
  5. A perfect gas ( 0.1 mol ) having Cv​=1.50R(independent of temperature) undergoes the above transformation from point 1 to point 4. If each step is reversible, the total work done (w) while going from point 1… Includes diagram2025 · 3 Apr · Shift 2 · Q24 · Numerical
  6. A sample of n -octane (1.14 g) was completely burnt in excess of oxygen in a bomb calorimeter, whose heat capacity is 5 kJ K−1. As a result of combustion reaction, the temperature of the calorimeter is…2025 · 3 Apr · Shift 2 · Q25 · Numerical
  7. 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.…2025 · 3 Apr · Shift 2 · Q5 · MCQ
  8. Let us consider a reversible reaction at temperature, T. In this reaction, both ΔH and ΔS were observed to have positive values. If the equilibrium temperature is Te , then the reaction becomes spontaneous…2025 · 4 Apr · Shift 1 · Q16 · MCQ
  9. One mole of an ideal gas expands isothermally and reversibly from 10dm3 to 20dm3 at 300 K . ΔU,q and work done in the process respectively are Given: R=8.3 J K−1 mol−1ln10=2.3log2=0.30log3=0.48…2025 · 4 Apr · Shift 1 · Q9 · MCQ
  10. Consider the given data : (a) HCl(g)+10H2​O(l)→HCl.10H2​OΔH=−69.01 kJ mol−1(b) HCl(g)+40H2​O(l)→HCl.40H2​OΔH=−72.79 kJ mol−1…2025 · 4 Apr · Shift 2 · Q15 · MCQ
  11. Total enthalpy change for freezing of 1 mol of water at 10∘C to ice at −10∘C is ​ (Given: Δfus ​H=x kJ/mol ​Cp​[H2​O(l)]=y J mol−1 K−1Cp​[H2​O( s)]=z J mol−1 K−1​…2025 · 7 Apr · Shift 1 · Q3 · MCQ
  12. The hydration energies of K+ and Cl− are −x and −y kJ/mol respectively. If the lattice energy of KCl is −z kJ/mol, then the heat of solution of KCl is :2025 · 7 Apr · Shift 2 · Q14 · MCQ
  13. The correct statement amongst the following is :2025 · 7 Apr · Shift 2 · Q20 · MCQ
  14. Resonance in X2​Y can be represented as The enthalpy of formation of X2​Y(X=X(g)+21​Y=Y(g)→X2​Y(g)) is 80 kJ mol −1. The magnitude of resonance energy of X2​Y is __ kJ… Includes diagram2025 · 8 Apr · Shift 2 · Q25 · Numerical
  15. A liquid when kept inside a thermally insulated closed vessel at 25∘C was mechanically stirred from outside. What will be the correct option for the following thermodynamic parameters ?2025 · 22 Jan · Shift 1 · Q10 · MCQ
  16. Match List - I with List - II. Choose the correct answer from the options given below : Includes table2025 · 22 Jan · Shift 2 · Q12 · MCQ
  17. Consider the following cases of standard enthalpy of reaction (ΔHr∘​ in kJmol−1) ​C2​H6​( g)+27​O2​( g)→2CO2​( g)+3H2​O(l)ΔH1∘​=−1550C( graphite )+O2​( g)→CO2​( g)ΔH2∘​=−393.5H2​( g)+21​O2​( g)→H2​O(l)ΔH3∘​=−286​…2025 · 22 Jan · Shift 2 · Q21 · Numerical
  18. Ice at −5∘C is heated to become vapor with temperature of 110∘C at atmospheric pressure. The entropy change associated with this process can be obtained from2025 · 23 Jan · Shift 1 · Q14 · MCQ
  19. The standard enthalpy and standard entropy of decomposition of N2​O4​ to NO2​ are 55.0 kJ mol−1 and 175.0 J/K/mol respectively. The standard free…2025 · 23 Jan · Shift 1 · Q22 · Numerical
  20. The bond dissociation enthalpy of X2​ΔHbond ∘​ calculated from the given data is ​kJmol−1. (Nearest integer) ​M+X−(s)→M+(g)+X−(g)ΔHlattice ∘​=800 kJ mol−1M( s)→M( g)ΔHsub ∘​=100 kJ mol−1​M( g)→M+(g)+e−(g)ΔHi∘​=500 kJ mol−1X( g)+e−(g)→X−(g)ΔHeg∘​=−300 kJ mol−1M( s)+21​X2​( g)→M+X−(s)ΔHf∘​=−400 kJ mol−1…2025 · 23 Jan · Shift 2 · Q22 · Numerical
  21. The effect of temperature on spontaneity of reactions are represented as : The incorrect combinations are : Includes table2025 · 23 Jan · Shift 2 · Q8 · MCQ
  22. Let us consider an endothermic reaction which is non-spontaneous at the freezing point of water. However, the reaction is spontaneous at boiling point of water. Choose the correct option.2025 · 24 Jan · Shift 1 · Q14 · MCQ
  23. Standard entropies of X2​,Y2​ and XY5​ are 70, 50 and 110 J K−1 mol−1 respectively. The temperature in Kelvin at which the reaction 21​X2​+25​Y2​⇌XY5​ΔH⊖=−35 kJ mol−1…2025 · 24 Jan · Shift 1 · Q25 · Numerical
  24. Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature?2025 · 24 Jan · Shift 2 · Q11 · MCQ
  25. ​S( g)+23​O2​( g)→SO3​( g)+2xkcalSO2​( g)+21​O2​( g)→SO3​( g)+ykcal​…2025 · 24 Jan · Shift 2 · Q4 · MCQ
  26. Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15 K . If pressure of the system is increased 2 times, keeping temperature constant, then identify correct observation from following2025 · 28 Jan · Shift 1 · Q20 · MCQ
  27. The formation enthalpies, ΔHf⊖​ for H(g)​ and O(g)​ are 220.0 and 250.0 kJ mol−1, respectively, at 298.15 K , and ΔHf⊖​…2025 · 28 Jan · Shift 1 · Q21 · Numerical
  28. Consider the following data : Heat of formation of CO2​(g)=−393.5 kJ mol−1 Heat of formation of H2​O(l)=−286.0 kJ mol−1 Heat of…2025 · 28 Jan · Shift 2 · Q24 · Numerical
  29. An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by tracing the path A→B→C→D→A as shown in the three cases above. Choose the correct option regarding ΔU : Includes diagram2025 · 28 Jan · Shift 2 · Q7 · MCQ
  30. 500 J of energy is transferred as heat to 0.5 mol of Argon gas at 298 K and 1.00 atm. The final temperature and the change in internal energy respectively are: Given: R = 8.3 J K-1 mol-12025 · 29 Jan · Shift 1 · Q5 · MCQ
  31. If C(diamond )→C(graphite) +X kJ mol−1 C (diamond) +O2​( g)→CO2​( g)+YkJmol−1 C (graphite) +O2​( g)→CO2​( g)+ZkJmol−1…2025 · 29 Jan · Shift 2 · Q15 · MCQ
  32. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following :2024 · 1 Feb · Shift 1 · Q2 · MCQ
  33. For a certain reaction at 300 K, K=10, then ΔG∘ for the same reaction is - ​×10−1 kJ mol−1. (Given R=8.314JK−1 mol−1…2024 · 1 Feb · Shift 2 · Q25 · Numerical
  34. The enthalpy of formation of ethane (C2​H6​) from ethylene by addition of hydrogen where the bond-energies of C−H,C−C,C=C,H−H are 414 kJ,347 kJ,615 kJ…2024 · 4 Apr · Shift 1 · Q24 · Numerical
  35. Three moles of an ideal gas are compressed isothermally from 60 L to 20 L using constant pressure of 5 atm. Heat exchange Q for the compression is - ​ Lit. atm.2024 · 4 Apr · Shift 2 · Q27 · Numerical
  36. The heat of combustion of solid benzoic acid at constant volume is −321.30 kJ at 27∘C. The heat of combustion at constant pressure is (−321.30−xR) kJ, the value of x is ​…2024 · 5 Apr · Shift 1 · Q22 · Numerical
  37. Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A) : Enthalpy of neutralisation of strong monobasic acid with strong monoacidic base is always −57 kJ mol−1…2024 · 5 Apr · Shift 1 · Q6 · MCQ
  38. Combustion of 1 mole of benzene is expressed at C6​H6​(l)+215​O2​( g)→6CO2​( g)+3H2​O(l).  The standard…2024 · 5 Apr · Shift 2 · Q28 · Numerical
  39. An ideal gas, Cv​=25​R, is expanded adiabatically against a constant pressure of 1 atm untill it doubles in volume. If the initial temperature and pressure is 298 K and 5 atm…2024 · 6 Apr · Shift 1 · Q24 · Numerical
  40. For the reaction at 298 K,2 A+B→C,ΔH=400 kJ mol−1 and ΔS=0.2 kJ mol−1 K−1. The reaction will become…2024 · 6 Apr · Shift 2 · Q21 · Numerical
  41. Consider the figure provided. 1 mol of an ideal gas is kept in a cylinder, fitted with a piston, at the position A, at 18∘C. If the piston is moved to position B, keeping the temperature unchanged,… Includes diagram2024 · 8 Apr · Shift 1 · Q25 · Numerical
  42. Δvap ​H⊖ for water is +40.79 kJ mol−1 at 1 bar and 100∘C. Change in internal energy for this vapourisation under same condition is ​kJ mol−1…2024 · 8 Apr · Shift 2 · Q21 · Numerical
  43. When equal volume of 1 M HCl and 1 M H2​SO4​ are separately neutralised by excess volume of 1MNaOH solution. x and y kJ of heat is liberated…2024 · 9 Apr · Shift 1 · Q28 · Numerical
  44. The heat of solution of anhydrous CuSO4​ and CuSO4​⋅5H2​O are −70 kJ mol−1 and +12 kJ mol−1 respectively. The heat of hydration of CuSO4​…2024 · 9 Apr · Shift 1 · Q29 · Numerical
  45. When ΔHvap​=30 kJ/mol and ΔSvap​=75 J mol−1 K−1, then the temperature of vapour, at one atmosphere is ​…2024 · 9 Apr · Shift 2 · Q27 · Numerical
  46. If three moles of an ideal gas at 300 K expand isothermally from 30 dm3 to 45 dm3 against a constant opposing pressure of 80 kPa, then the amount of heat transferred is ​…2024 · 27 Jan · Shift 1 · Q24 · Numerical
  47. For a certain thermochemical reaction M→N at T=400 K,ΔH⊖=77.2 kJ mol−1,ΔS=122 JK−1,log equilibrium…2024 · 27 Jan · Shift 2 · Q30 · Numerical
  48. Which of the following is not correct?2024 · 29 Jan · Shift 1 · Q14 · MCQ
  49. Standard enthalpy of vapourisation for CCl4​ is 30.5 kJ mol−1. Heat required for vapourisation of 284 g of CCl4​ at constant temperature is ​kJ.…2024 · 29 Jan · Shift 2 · Q22 · Numerical
  50. An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by tracing the path A→B→C→A as shown in the diagram… Includes diagram2024 · 30 Jan · Shift 1 · Q27 · Numerical
  51. Two reactions are given below: ​2Fe(s)​+23​O2( g)​→Fe2​O3( s)​,ΔH∘=−822 kJ/molC(s)​+21​O2( g)​→CO(g)​,ΔH∘=−110 kJ/mol​…2024 · 30 Jan · Shift 2 · Q30 · Numerical
  52. Consider the following reaction at 298 K⋅23​O2(g)​⇌O3(g)​⋅KP​=2.47×10−29. Δr​G⊖ for the reaction is ​…2024 · 31 Jan · Shift 1 · Q21 · Numerical
  53. If 5 moles of an ideal gas expands from 10 L to a volume of 100 L at 300 K under isothermal and reversible condition then work, w, is −x J. The value of x is ​…2024 · 31 Jan · Shift 2 · Q28 · Numerical
  54. At 25∘C, the enthalpy of the following processes are given : What would be the value of X for the following reaction ? ​ (Nearest integer) H2​O(g)→H(g)+OH(g) ΔH∘=X kJ mol−1… Includes table2023 · 1 Feb · Shift 1 · Q16 · Numerical
  55. 0.3 g of ethane undergoes combustion at 27∘C in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by 0.5∘C. The heat evolved during combustion…2023 · 1 Feb · Shift 2 · Q20 · Numerical
  56. Consider the graph of Gibbs free energy G vs Extent of reaction. The number of statement/s from the following which are true with respect to points (a), (b) and (c) is ​ A. Reaction is spontaneous at (a) and (b) B.… Includes diagram2023 · 6 Apr · Shift 1 · Q17 · Numerical
  57. The value of logK for the reaction A⇌B at 298 K is ​. (Nearest integer) Given: ΔH∘=−54.07 kJ mol−1ΔS∘=10 J K−1 mol−1…2023 · 6 Apr · Shift 1 · Q19 · Numerical
  58. Consider the following data Heat of combustion of H2​(g)=−241.8 kJ mol−1 Heat of combustion of C(s)=−393.5 kJ mol−1 Heat of…2023 · 6 Apr · Shift 2 · Q18 · Numerical
  59. When a 60 W electric heater is immersed in a gas for 100 s in a constant volume container with adiabatic walls, the temperature of the gas rises by 5∘C. The heat capacity of the given gas is ​JK−1…2023 · 8 Apr · Shift 1 · Q19 · Numerical
  60. For complete combustion of ethene. C2​H4​(g)+3O2​(g)→2CO2​(g)+2H2​O(l) the amount of heat produced as measured in bomb…2023 · 8 Apr · Shift 2 · Q18 · Numerical
  61. Given ΔH0 for the reaction C(graphite)+21​O2​(g)→CO(g) is : Includes table2023 · 10 Apr · Shift 1 · Q9 · MCQ
  62. The number of endothermic process/es from the following is ​. A. I2​( g)→2I(g) B. HCl(g)→H(g)+Cl(g)…2023 · 10 Apr · Shift 2 · Q18 · Numerical
  63. Solid fuel used in rocket is a mixture of Fe2​O3​ and Al(in ratio 1 : 2). The heat evolved (kJ) per gram of the mixture is ​. (Nearest integer) Given: ΔHfθ​(Al2​O3​)=−1700 kJ mol−1ΔHfθ​(Fe2​O3​)=−840 kJ mol−1…2023 · 11 Apr · Shift 1 · Q23 · Numerical
  64. The total number of intensive properties from the following is ​ Volume, Molar heat capacity, Molarity, Eθ cell, Gibbs free energy change, Molar mass, Mole2023 · 11 Apr · Shift 2 · Q17 · Numerical
  65. One mole of an ideal gas at 350 K is in a 2.0 L vessel of thermally conducting walls, which are in contact with the surroundings. It undergoes isothermal reversible expansion from 2.0 L to 3.0 L against…2023 · 12 Apr · Shift 1 · Q22 · Numerical
  66. A2​+B2​→2AB.ΔHf0​=−200 kJ mol−1 AB,A2​ and B2​ are diatomic molecules. If the bond enthalpies of A2​, B2​…2023 · 13 Apr · Shift 1 · Q21 · Numerical
  67. What happens when methane undergoes combustion in systems A and B respectively? Includes diagram2023 · 13 Apr · Shift 2 · Q1 · MCQ
  68. 30.4 kJ of heat is required to melt one mole of sodium chloride and the entropy change at the melting point is 28.4 J K−1 mol−1 at 1 atm. The melting point of sodium chloride is ​…2023 · 15 Apr · Shift 1 · Q20 · Numerical
  69. For independent process at 300 K The number of non-spontaneous process from the following is ​ Includes table2023 · 24 Jan · Shift 1 · Q14 · Numerical
  70. One mole of an ideal monoatomic gas is subjected to changes as shown in the graph. The magnitude of the work done (by the system or on the system) is ​ J (nearest integer) Given ; log2=0.3ln10=2.3 Includes diagram2023 · 24 Jan · Shift 2 · Q16 · Numerical
  71. Following figure shows spectrum of an ideal black body at four different temperatures. The number of correct statement/s from the following is ​. A. T4​>T3​>T2​>T1​ B. The black body consists… Includes diagram2023 · 24 Jan · Shift 2 · Q18 · Numerical
  72. An athlete is given 100 g of glucose (C 6​ H 12​ O 6​) for energy. This is equivalent to 1800kJ of energy. The 50% of this energy gained is utilized by the athlete for sports activities at the event. In order to avoid storage of…2023 · 25 Jan · Shift 1 · Q19 · Numerical
  73. 28.0 L of CO 2​ is produced on complete combustion of 16.8 L gaseous mixture of ethene and methane at 25 ∘ C and 1 atm. Heat evolved during the combustion process is ​ kJ. Given : ΔHc​ (CH4​)=−900 kJ mol−1ΔHc​ (C2​H4​)=−1400 kJ mol−1…2023 · 25 Jan · Shift 2 · Q14 · Numerical
  74. Which of the following relations are correct? (A) ΔU=q+pΔV(B) ΔG=ΔH−TΔS(C) ΔS=Tqrev​​(D) ΔH=ΔU−ΔnRT Choose the most appropriate…2023 · 29 Jan · Shift 2 · Q3 · MCQ
  75. When 2 litre of ideal gas expands isothermally into vacuum to a total volume of 6 litre, the change in internal energy is ​ J. (Nearest integer)2023 · 30 Jan · Shift 1 · Q17 · Numerical
  76. 1 mole of ideal gas is allowed to expand reversibly and adiabatically from a temperature of 27∘C. The work done is 3 kJ mol−1. The final temperature of the gas is ​K…2023 · 30 Jan · Shift 2 · Q19 · Numerical
  77. The enthalpy change for the conversion of 21​Cl2​( g) to Cl−(aq) is (−) ​kJmol−1(Nearest integer) Given : Δdis​HCl2( g)θ​⊖​=240 kJ mol−1,Δeg​HCl(g)​⊖​=−350 kJ mol−1…2023 · 31 Jan · Shift 1 · Q18 · Numerical
  78. Enthalpies of formation of CCl4​( g),H2​O(g),CO2​( g) and HCl(g) are −105,−242,−394 and −92 kJmol−1 respectively. The…2023 · 31 Jan · Shift 2 · Q17 · Numerical
  79. At 25 ∘ C and 1 atm pressure, the enthalpies of combustion are as given below : The enthalpy of formation of ethane is Includes table2022 · 24 Jun · Shift 2 · Q4 · MCQ
  80. The enthalpy of combustion of propane, graphite and dihydrogen at 298 K are −2220.0 kJ mol−1,−393.5 kJ mol−1 and −285.8 kJ mol−1 respectively. The…2022 · 25 Jul · Shift 1 · Q13 · Numerical
  81. While performing a thermodynamics experiment, a student made the following observations. HCl + NaOH → NaCl + H2​O Δ H = − 57.3 kJ mol − 1 CH3​COOH + NaOH → CH3​COONa + H2​O Δ H = − 55.3 kJ mol…2022 · 25 Jul · Shift 2 · Q16 · Numerical
  82. The standard entropy change for the reaction 4Fe(s) + 3O2​(g) → 2Fe2​O3​(s) is − 550 J K − 1 at 298 K. [Given : The standard enthalpy change for the reaction is − 165 kJ mol − 1]. The temperature in K at which the…2022 · 25 Jun · Shift 1 · Q17 · Numerical
  83. At 25 ∘ C and 1 atm pressure, the enthalpy of combustion of benzene (I) and acetylene (g) are − 3268 kJ mol − 1 and − 1300 kJ mol − 1, respectively. The change in enthalpy for the reaction 3 C2​H2​(g) → C6​H6​ (I),…2022 · 25 Jun · Shift 2 · Q2 · MCQ
  84. 2.4 g coal is burnt in a bomb calorimeter in excess of oxygen at 298 K and 1 atm pressure. The temperature of the calorimeter rises from 298 K to 300 K. The enthalpy change during…2022 · 26 Jul · Shift 1 · Q18 · Numerical
  85. For the reaction H2​F2​( g)→H2​( g)+F2​( g)ΔU=−59.6 kJ mol−1 at 27∘C. The enthalpy change for the…2022 · 26 Jul · Shift 2 · Q14 · Numerical
  86. For complete combustion of methanol CH3​OH(I) + 23​ O2​(g) → CO2​(g) + 2H2​O(I) the amount of heat produced as measured by bomb calorimeter is 726 kJ mol − 1 at 27 ∘ C. The enthalpy of combustion for the…2022 · 26 Jun · Shift 1 · Q12 · Numerical
  87. A fish swimming in water body when taken out from the water body is covered with a film of water of weight 36 g. When it is subjected to cooking at 100 ∘ C, then the internal energy for vaporization in kJ mol − 1 is ​…2022 · 26 Jun · Shift 2 · Q18 · Numerical
  88. The molar heat capacity for an ideal gas at constant pressure is 20.785 J K−1 mol−1. The change in internal energy is 5000 J upon heating it from 300 K to 500 K.…2022 · 27 Jul · Shift 1 · Q17 · Numerical
  89. A gas (Molar mass = 280  g mol−1) was burnt in excess O2​ in a constant volume calorimeter and during combustion the temperature of calorimeter increased from 298.0 K to 298.45K.…2022 · 27 Jul · Shift 2 · Q16 · Numerical
  90. Match List-I with List-II. Choose the correct answer from the options given below : Includes table2022 · 27 Jun · Shift 1 · Q3 · MCQ
  91. When 5 moles of He gas expand isothermally and reversibly at 300 K from 10 litre to 20 litre, the magnitude of the maximum work obtained is ​ J. [nearest integer] (Given : R = 8.3 J K − 1 mol − 1 and log 2 =…2022 · 27 Jun · Shift 2 · Q17 · Numerical
  92. Which of the following relation is not correct?2022 · 28 Jul · Shift 1 · Q2 · MCQ
  93. Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A : The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state.…2022 · 28 Jul · Shift 2 · Q2 · MCQ
  94. Among the following the number of state variables is ​. Internal energy (U) Volume (V) Heat (q) Enthalpy (H)2022 · 28 Jul · Shift 2 · Q20 · Numerical
  95. 4.0 L of an ideal gas is allowed to expand isothermally into vacuum until the total volume is 2.0 L. The amount of heat absorbed in this expansion is ​ L atm.2022 · 28 Jun · Shift 1 · Q17 · Numerical
  96. For combustion of one mole of magnesium in an open container at 300 K and 1 bar pressure, Δ CH Θ=− 601.70 kJ mol − 1, the magnitude of change in internal energy for the reaction is ​ kJ. (Nearest…2022 · 28 Jun · Shift 2 · Q13 · Numerical
  97. When 600 mL of 0.2 M HNO3​ is mixed with 400 mL of 0.1 M NaOH solution in a flask, the rise in temperature of the flask is ​×10−2∘C. (Enthalpy of neutralisation =57 kJ mol−1…2022 · 29 Jul · Shift 1 · Q18 · Numerical
  98. 17.0 g of NH3​ completely vapourises at − 33.42 ∘ C and 1 bar pressure and the enthalpy change in the process is 23.4 kJ mol − 1. The enthalpy change for the vapourisation of 85 g of NH3​ under the same conditions is ​…2022 · 29 Jun · Shift 1 · Q11 · Numerical
  99. 2.2 g of nitrous oxide (N2​O) gas is cooled at a constant pressure of 1 atm from 310 K to 270 K causing the compression of the gas from 217.1 mL to 167.75 mL. The change in internal energy of the process, Δ U is '− x' J. The…2022 · 29 Jun · Shift 2 · Q15 · Numerical
  100. 1.0 mol of monoatomic ideal gas is expanded from state 1 to state 2 as shown in the figure. The magnitude of the work done for the expansion of gas from state 1 to state 2 at 300 K is ​ J. (Nearest integer) (Given… Includes diagram2022 · 30 Jun · Shift 1 · Q17 · Numerical
  101. Δ G ∘ vs T plot for the formation of MgO, involving reaction 2Mg + O2​ → 2MgO, will look like :2022 · 30 Jun · Shift 1 · Q6 · MCQ
  102. For the reaction, 2NO2​(g) ⇌ N2​O4​(g), when Δ S = − 176.0 JK − 1 and Δ H = − 57.8 kJ mol − 1, the magnitude of Δ G at 298 K for the reaction is ​ kJ mol − 1.…2021 · 1 Sep · Shift 2 · Q16 · Numerical
  103. At 25 ∘ C, 50 g of iron reacts with HCl to form FeCl2​. The evolved hydrogen gas expands against a constant pressure of 1 bar. The work done by the gas during this expansion is ​ J. (Round off to the…2021 · 16 Mar · Shift 2 · Q17 · Numerical
  104. The standard enthalpies of formation of Al2​O3​ and CaO are − 1675 kJ mol-1 and − 635 kJ mol − 1 respectively. For the reaction 3CaO + 2Al → 3Ca + Al2​O3​ the standard reaction enthalpy Δ rH0 = ​…2021 · 17 Mar · Shift 1 · Q21 · Numerical
  105. During which of the following processes, does entropy decrease? (A) Freezing of water to ice at 0 ∘ C (B) Freezing of water to ice at − 10 ∘ C (C) N2​(g) + 3H2​(g) → 2NH3​(g) (D) Adsorption of CO(g) on lead…2021 · 17 Mar · Shift 2 · Q7 · MCQ
  106. For the reaction C2​H6​ → C2​H4​ + H2​ the reaction enthalpy Δ rH = ​ kJ mol − 1. (Round off to the Nearest Integer). [ Given : Bond enthalpies in kJ mol − 1 : C-C : 347, C = C : 611; C-H :…2021 · 18 Mar · Shift 1 · Q18 · Numerical
  107. For a given chemical reaction A → B at 300 K the free energy change is − 49.4 kJ mol − 1 and the enthalpy of reaction is 51.4 kJ mol − 1. The entropy change of the reaction is ​ JK − 1 mol − 1.2021 · 20 Jul · Shift 2 · Q17 · Numerical
  108. If the standard molar enthalpy change for combustion of graphite powder is − 2.48 × 102 kJ mol − 1, the amount of heat generated on combustion of 1 g of graphite powder is ​ kJ. (Nearest integer)2021 · 22 Jul · Shift 2 · Q20 · Numerical
  109. Assuming ideal behaviour, the magnitude of log K for the following reaction at 25 ∘ C is x × 10 − 1. The value of x is ​. (Integer answer) $$3HC \equiv C{H_{(g)}} \rightleftharpoons…2021 · 24 Feb · Shift 2 · Q18 · Numerical
  110. The reaction of cyanamide, NH2​CN(s) with oxygen was run in a bomb calorimeter and Δ U was found to be − 742.24 kJ mol − 1. The magnitude of Δ H298 for the reaction NH2​CH(S)​+23​O2(g)​→N2(g)​+O2(g)​+H2​O(I)​…2021 · 25 Feb · Shift 1 · Q16 · Numerical
  111. The ionization enthalpy of Na+ formation from Na(g) is 495.8 kJ mol − 1, while the electron gain enthalpy of Br is − 325.0 kJ mol − 1. Given the lattice enthalpy of NaBr is − 728.4 kJ mol − 1. The energy for the…2021 · 25 Feb · Shift 1 · Q17 · Numerical
  112. Five moles of an ideal gas at 293 K is expanded isothermally from an initial pressure of 2.1 MPa to 1.3 MPa against at constant external pressure 4.3 MPa. The heat transferred in this process is ​ kJ mol − 1.…2021 · 25 Feb · Shift 2 · Q20 · Numerical
  113. At 298 K, the enthalpy of fusion of a solid (X) is 2.8 kJ mol − 1 and the enthalpy of vaporisation of the liquid (X) is 98.2 kJ mol − 1. The enthalpy of sublimation of the substance (X) in kJ mol − 1 is ​.…2021 · 25 Jul · Shift 1 · Q21 · Numerical
  114. A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy is ​ J. (Nearest integer)2021 · 25 Jul · Shift 2 · Q16 · Numerical
  115. The Born-Haber cycle for KCl is evaluated with the following data : Δf​HΘ for KCl =− 436.7 kJ mol − 1 ; Δsub​HΘ for K = 89.2 kJ mol − 1 ; Δionization​HΘ for K = 419.0…2021 · 26 Aug · Shift 1 · Q20 · Numerical
  116. For water Δ vap H = 41 kJ mol − 1 at 373 K and 1 bar pressure. Assuming that water vapour is an ideal gas that occupies a much larger volume than liquid water, the internal energy change during evaporation of water is ​…2021 · 26 Aug · Shift 2 · Q15 · Numerical
  117. For a chemical reaction A + B ⇌ C + D (Δr​HΘ = 80 kJ mol − 1) the entropy change Δr​SΘ depends on the temperature T (in K) as Δr​SΘ = 2T (J K − 1mol − 1). Minimum temperature…2021 · 26 Feb · Shift 1 · Q16 · Numerical
  118. An exothermic reaction X → Y has an activation energy 30 kJ mol − 1. If energy change Δ E during the reaction is − 20 kJ, then the activation energy for the reverse reaction in kJ is ​. (Integer…2021 · 26 Feb · Shift 1 · Q17 · Numerical
  119. The average S-F bond energy in kJ mol − 1 of SF6​ is ​. (Rounded off to the nearest integer) [Given : The values of standard enthalpy of formation of SF6​(g), S(g) and F(g) are - 1100, 275 and 80 kJ mol − 1…2021 · 26 Feb · Shift 2 · Q20 · Numerical
  120. 200 mL of 0.2 M HCl is mixed with 300 mL of 0.1 M NaOH. The molar heat of neutralization of this reaction is − 57.1 kJ. The increase in temperature in ∘ C of the system on mixing is x × 10 − 2. The value of x is ​…2021 · 27 Aug · Shift 1 · Q20 · Numerical
  121. Two flasks I and II shown below are connected by a valve of negligible volume. When the valve is opened, the final pressure of the system in bar is x × 10 − 2. The value of x is ​. (Integer answer) [Assume… Includes diagram2021 · 27 Aug · Shift 2 · Q15 · Numerical
  122. Data given for the following reaction is as follows : FeO(s) + C(graphite) → Fe(s) + CO(g) The minimum temperature in K at which the reaction becomes spontaneous is ​. (Integer answer) Includes table2021 · 27 Aug · Shift 2 · Q22 · Numerical
  123. For water at 100 ∘ C and 1 bar, Δ vap H −Δ vap U = ​× 102 J mol − 1. (Round off to the Nearest Integer) [Use : R = 8.31 J mol − 1 K − 1] [Assume volume of H2​O(l) is much smaller…2021 · 27 Jul · Shift 1 · Q20 · Numerical
  124. When 400 mL of 0.2 M H2​SO4​ solution is mixed with 600 mL of 0.1 M NaOH solution, the increase in temperature of the final solution is ​× 10 − 2 K. (Round off to the nearest integer). [Use : H+ (aq)…2021 · 27 Jul · Shift 2 · Q14 · Numerical
  125. The incorrect expression among the following is :2021 · 31 Aug · Shift 2 · Q10 · MCQ
  126. The internal energy change (in J) When 90 g of water undergoes complete evaporation at 100oC is ​. (Given : Δ Hvap for water at 373 K = 41 kJ/mol, R = 8.314 JK–1 mol–1)2020 · 2 Sep · Shift 1 · Q1 · Numerical
  127. The heat of combustion of ethanol into carbon dioxide and water is – 327 kcal at constant pressure. The heat evolved (in cal) at constant volume and 27oC (if all gases behave ideally) is (R = 2 cal mol–1 K–1) ​.2020 · 2 Sep · Shift 2 · Q5 · Numerical
  128. For one mole of an ideal gas, which of these statements must be true? (a) U and H each depends only on temperature (b) Compressibility factor z is not equal to 1 (c) CP, m – CV, m = R (d) dU = CVdT for any process2020 · 4 Sep · Shift 1 · Q2 · MCQ
  129. Five moles of an ideal gas at 1 bar and 298 K is expanded into vacuum to double the volume. The work done is :2020 · 4 Sep · Shift 2 · Q18 · MCQ
  130. The process that is NOT endothermic in nature is :2020 · 4 Sep · Shift 2 · Q3 · MCQ
  131. For a dimerization reaction, 2A(g) → A2​(g) at 298 K, Δ Uo = –20 kJ mol–1, Δ So = –30 JK–1 mol–1, then the Δ Go will be ​ J.2020 · 5 Sep · Shift 2 · Q2 · Numerical
  132. Lattice enthalpy and enthalpy of solution of NaCl are 788 kJ mol–1, and 4 kJ mol–1, respectively. The hydration enthalpy of NaCl is :2020 · 5 Sep · Shift 2 · Q9 · MCQ
  133. For a reaction, 4M(s) + nO2​(g) → 2M2​On​(s) the free energy change is plotted as a function of temperature. The temperature below which the oxide is stable could be inferred from the plot as the point at which :2020 · 6 Sep · Shift 2 · Q5 · MCQ
  134. For the reaction : A(l) → 2B(g) ΔU=2.1kcal,ΔS=20calK−1 at 300 K Hence Δ G in kcal is :2020 · 7 Jan · Shift 1 · Q2 · Numerical
  135. The standard heat of formation (Δf​H2980​) of ethane (in kj/mol), if the heat of combustion of ethane, hydrogen and graphite are - 1560, -393.5 and -286 Kj/mol, respectively is :2020 · 7 Jan · Shift 2 · Q19 · Numerical
  136. The magnitude of work done by a gas that undergoes a reversible expansion along the path ABC shown in the figure is ​. Includes diagram2020 · 8 Jan · Shift 1 · Q7 · Numerical
  137. At constant volume, 4 mol of an ideal gas when heated from 300 K to 500K changes its internal energy by 5000 J. The molar heat capacity at constant volume is ​.2020 · 8 Jan · Shift 2 · Q8 · Numerical
  138. If enthalpy of atomisation for Br2​(1) is x kJ/mol and bond enthalpy for Br2​ is y kJ/mol, the relation between them :2020 · 9 Jan · Shift 1 · Q2 · MCQ
  139. The true statement amongst the following is :2020 · 9 Jan · Shift 2 · Q10 · MCQ
  140. 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 work is zero)2019 · 8 Apr · Shift 1 · Q10 · MCQ
  141. For silver, Cp(J K–1 mol–1) = 23 +0.01 T. If the temperature (T) of 3 moles of silver is raised from 300 K to 1000 K at 1 atm pressure, the value of ΔH will be close to :2019 · 8 Apr · Shift 1 · Q22 · MCQ
  142. 5 moles of an ideal gas at 100 K are allowed to undergo reversible compression till its temperature becomes 200 K. If CV = 28 JK–1mol–1, calculate Δ U and Δ pV for this process. (R = 8.0 JK–1 mol–1]2019 · 8 Apr · Shift 2 · Q8 · MCQ
  143. Among the following, the set of parameters that represents path function, is : (A) q + w (B) q (C) w (D) H–TS2019 · 9 Apr · Shift 1 · Q6 · MCQ
  144. During compression of a spring the work done is 10kJ and 2kJ escaped to the surroundings as heat. The change in internal energy, Δ U(inkJ) is :2019 · 9 Apr · Shift 2 · Q16 · MCQ
  145. Consider the reversible isothermal expansion of an ideal gas in a closed system at two different temperatures T1 and T2 (T1 < T2). The correct graphical depiction of the dependence of work done (w) on the final volume (V) is :2019 · 9 Jan · Shift 1 · Q11 · MCQ
  146. The entropy change associated with the conversion of 1 kg of ice at 273 K to water vapours at 383 K is : (Specific heat of water liquid and water vapour are 4.2 kJ K − 1 kg − 1 and 2.0 kJ K − 1 kg − 1; heat of liquid fusion and…2019 · 9 Jan · Shift 2 · Q23 · MCQ
  147. A process will be spontaneous at all temperatures if :2019 · 10 Apr · Shift 1 · Q11 · MCQ
  148. The difference between Δ H and Δ U (Δ H – Δ U), when the combustion of one mole of heptane(l) is carried out at a temperature T, is equal to :2019 · 10 Apr · Shift 2 · Q7 · MCQ
  149. A process has Δ H = 200 J mol–1 and Δ S = 40 JK–1 mol–1. Out of the values given below, choose the minimum temperature above which the process will be spontaneous :2019 · 10 Jan · Shift 1 · Q23 · MCQ
  150. An ideal gas undergoes isothermal compression from 5m3 to 1 m3 against a constant external pressure of 4 Nm–2. Heat released in this process is used to increase the temperature of 1 mole of Al. If molar heat capacity of Al is 24 J mol–1…2019 · 10 Jan · Shift 2 · Q14 · MCQ
  151. The process with negative entropy change is :2019 · 10 Jan · Shift 2 · Q17 · MCQ
  152. For the chemical reaction X ⇌ Y, the standard reaction Gibbs energy depends on temperature T (in K) as Δ rGo (in kJ mol–1) = 120 −83​ T. The major component of the reaction mixture at T is :2019 · 11 Jan · Shift 1 · Q1 · MCQ
  153. Two blocks of the same metal having same mass and at temperature T1 and T2, respectively, are brought in contact with each other and allowed to attain thermal equilibrium at constant pressure. The change in entropy, Δ S, for this…2019 · 11 Jan · Shift 1 · Q16 · MCQ
  154. The standard reaction Gibbs energy for a chemical reaction at an absolute temperature T is given by Δ rGo = A – BT Where A and B are non-zero constants. Which of the following is TRUE about this reaction?2019 · 11 Jan · Shift 2 · Q15 · MCQ
  155. The reaction, MgO(s) + C(s) → Mg(s) + CO(g), for which Δ rHo + 491.1 kJ mol–1 and Δ rSo = 198.0 JK–1 mol–1, is not feasible at 298 K. Temperature above which reaciton will be feasible is :2019 · 11 Jan · Shift 2 · Q17 · MCQ
  156. For the equilibrium, 2H2​O ⇌ H3​O+ + OH −, the value of Δ Go at 298 K is approximately :2019 · 11 Jan · Shift 2 · Q9 · MCQ
  157. An ideal gas is allowed to expand form 1 L to 10 L against a constant external pressure of I bar. The work done in kJ is :2019 · 12 Apr · Shift 1 · Q12 · MCQ
  158. Enthalpy of sublimation of iodine is 24 cal g–1 at 200 oC. If specific heat of I2​(s) and l2 (vap) are 0.055 and 0.031 cal g–1K –1 respectively, then enthalpy of sublimation of iodine at 250 oC in cal g–1 is :2019 · 12 Apr · Shift 1 · Q17 · MCQ
  159. For diatomic ideal gas in a closed system, which of the following plots does not correctly describe the relation between various thermodynamic quantities?2019 · 12 Jan · Shift 1 · Q15 · MCQ
  160. Given (i) C (graphite) + O2​(g) → CO2​(g); Δ rH Θ = x kJ mol − 1 (ii) C(graphite) + 21​ O2​(g) → CO(g); Δ rH Θ = y kJ mol − 1 (iii) CO(g) + 21​ O2​(g) →…2019 · 12 Jan · Shift 2 · Q14 · MCQ
  161. The combination of plots which does not represent isothermal expansion of an ideal gas is – Includes diagram2019 · 12 Jan · Shift 2 · Q18 · MCQ
  162. An ideal gas undergoes a cyclic process as shown in Figure. Δ UBC = − 5 kJ mol-1, qAB = 2 kJ mol-1, WAB =− 5 kJ mol-1, WCA = 3 kJ mol-1. Heat absorbed by the system during process CA is : Includes diagram2018 · 15 Apr · Shift 1 · Q10 · MCQ
  163. For which of the following reactions, Δ H is equal to Δ U?2018 · 15 Apr · Shift 1 · Q20 · MCQ
  164. Δ fGo at 500 K for substance 'S' in liquid state and gaseous state are +100.7 kcl mol-1 and +103 kcal mol-1, respectively. Vapour pressure of liquid 'S' at 500 K is approximately equal to : ( R = 2 cal K-1 mol-1 )2018 · 15 Apr · Shift 2 · Q13 · MCQ
  165. Given (i) 2Fe2​O3​(s) → 4Fe(s) + 3O2​(g); Δ rGo = + 1487.0 kJ mol-1 (ii) 2CO(g) + O2​(g) → 2CO2​(g); Δ rGo = − 514.4 kJ mol-1 Free energy change, Δ rGo for the reaction 2Fe2​O3​(s) + 6CO(g) →…2018 · 15 Apr · Shift 2 · Q20 · MCQ
  166. At 320 K, a gas A2​ is 20% dissociated to A(g). The standard free energy change at 320 K and 1 atm in J mol-1 is approximately : (R = 8.314 JK-1 mol-1; ln2 = 0.693; ln 3 = 1.098)2018 · 16 Apr · Shift 1 · Q23 · MCQ
  167. For which of the following processes, Δ S is negative ?2018 · 16 Apr · Shift 1 · Q9 · MCQ
  168. Which of the following lines correctly show the temperature dependence of equilibrium constant K, for an exothermic reaction? Includes diagram2018 · Shift 0 · Q22 · MCQ
  169. The combustion of benzene(l) gives CO2​(g) and H2​O(l). Given that heat of combustion of benzene at constant volume is –3263.9 kJ mol–1 at 25oC; heat of combustion (in kJ mol–1) of benzene at constant pressure will be : (R = 8.314 JK–1…2018 · Shift 0 · Q23 · MCQ
  170. The enthalpy change on freezing of 1 mol of water at 5oC to ice at −5oC is : (Given Δ fusH = 6 kJ mol − 1 at 0oC, Cp(H2​O, ℓ = 75.3J mol − 1 K − 1) Cp(H2​O s) =36.8 J mol − 1 K − 1)2017 · 8 Apr · Shift 1 · Q17 · MCQ
  171. For a reaction, A(g) → A(ℓ); Δ H= − 3RT. The correct statement for the reaction is :2017 · 8 Apr · Shift 1 · Q23 · MCQ
  172. A gas undergoes change from state A to state B. In this process, the heat absorbed and work done by the gas is 5 J and 8 J, respectively. Now gas is brought back to A by another process during which 3 J of heat is evolved. In this reverse…2017 · 9 Apr · Shift 1 · Q19 · MCQ
  173. An ideal gas undergoes isothermal expansion at constant pressure. During the process :2017 · 9 Apr · Shift 1 · Q23 · MCQ
  174. Given, C(graphite)​+O2​→CO2​(g); Δr​Ho= - 393.5 kJ mol-1 H2​(g)+21​O2​(g)→H2​O(l)Δr​Ho= - 285.8 kJ mol-1 CO2​(g)+2H2​O(l)→CH4​(g)+2O2​(g)Δr​Ho…2017 · Shift 0 · Q18 · MCQ
  175. Δ U is equal to :2017 · Shift 0 · Q21 · MCQ
  176. For the reaction, A(g) + B(g) → C(g) + D(g), Δ Ho and Δ So are, respectively, − 29.8 kJ mol−1 and −0.100 kJ K−1 mol−1 at 298 K. The equilibrium constant for the reaction at 298 K is :2016 · 9 Apr · Shift 1 · Q12 · MCQ
  177. A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reaction among the following :2016 · 9 Apr · Shift 1 · Q16 · MCQ
  178. The plot shows the variation of −ln Kp versus temperature for the two reactions. M(s) +21​ O2​(g) → MO(s) and C(s) +21​ O2​(g) → CO(s) Identify the correct statement : Includes diagram2016 · 9 Apr · Shift 1 · Q2 · MCQ
  179. If 100 mole of H2​O2​ decompose at 1 bar and 300 K, the work done (kJ) by one mole of O2​(g) as it expands against 1 bar pressure is : 2H2​O2​(l) ⇌ 2H2​O(l) + O2​(g) (R = 8.3 J K − 1 mol − 1)2016 · 10 Apr · Shift 1 · Q17 · MCQ
  180. The heats of combustion of carbon and carbon monoxide are –393.5 and –283.5 kJ mol–1, respectively. The heat of formation (in kJ) of carbon monoxide per mole is :2016 · Shift 0 · Q9 · MCQ
  181. The following reaction is performed at 298 K 2NO(g) + O2​ (g) ⇋ 2NO2​ (g) The standard free energy of formation of NO(g) is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of NO2​(g) at…2015 · Shift 0 · Q5 · MCQ
  182. For complete combustion of ethanol, C2​H5​OH(l) + 3O2​(g) → 2CO2​(g) + 3H2​O(l) the amount of heat produced as measured in bomb calorimeter, is 1364.47 kJ mol–1 at 25oC. Assuming ideality the Enthalpy of combustion, $\Delta…2014 · Shift 0 · Q6 · MCQ
  183. A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0oC. As it does so, it absorbs 208J of heat. The values of q and w for the process will be : (R = 8.314 J/mol K) ( l n…2013 · Shift 0 · Q1 · MCQ
  184. The incorrect expression among the following is :2012 · Shift 0 · Q7 · MCQ
  185. The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27oC is :2011 · Shift 0 · Q6 · MCQ
  186. For a particular reversible reaction at temperature T, ∆H and ∆S were found to be both +ve. If Te is the temperature at equilibrium, the reaction would be spontaneous when :2010 · Shift 0 · Q8 · MCQ
  187. The standard enthalpy of formation of NH3​ is –46.0 kJ mol–1. If the enthalpy of formation of H2​ from its atoms is –436 kJ mol–1 and that of N2​ is –712 kJ mol–1, the average bond enthalpy of N–H bond in NH3​ is :2010 · Shift 0 · Q9 · MCQ
  188. On the basis of the following thermochemical data : (Δf​GoH(aq)+​= 0) H2​O(l) → H+(aq) + OH−(aq); ΔH= 57.32 kJ H2​(g) +21​O2​(g)→ H2​O(l); ΔH = -286.20 kJ The value of enthalpy of…2009 · Shift 0 · Q7 · MCQ
  189. Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below: 21​Cl2​(g) 21​Δdiss​HΘ​ Cl(g)Δeg​HΘ​Cl−(g)ΔHyd​HΘ​Cl−(aq)…2008 · Shift 0 · Q10 · MCQ
  190. Standard entropy of X2​, Y2​ and XY3​ are 60, 40 and 50 JK−1 mol−1 , respectively. For the reaction, 21​X2​+23​Y2​→ XY3​, ΔH = -30 kJ, to be at equilibrium, the temperature will be :2008 · Shift 0 · Q9 · MCQ
  191. Assuming that water vapour is an ideal gas, the internal energy change (ΔU) when 1 mol of water is vapourised at 1 bar pressure and 100∘C(Given : molar enthalpy of vapourisation of water at 1 bar…2007 · Shift 0 · Q14 · MCQ
  192. Identify the correct statement regarding a spontaneous process :2007 · Shift 0 · Q7 · MCQ
  193. In conversion of lime-stone to lime, CaCO3​(s) → CaO(s) + CO2​ (g) the vales of ∆H° and ∆S° are +179.1 kJ mol−1 and 160.2 J/K respectively at 298 K and 1 bar. Assuming that ∆H° do not change with temperature, temperature above…2007 · Shift 0 · Q8 · MCQ
  194. The standard enthalpy of formation Δf​Ho at 298 K for methane, CH4​(g), is –74.8 kJ mol–1. The additional information required to determine the average energy for C – H bond formation would be :2006 · Shift 0 · Q1 · MCQ
  195. An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If Ti is the initial temperature and Tf is the final temperature, which of the following statements is correct?2006 · Shift 0 · Q2 · MCQ
  196. (ΔH−ΔU) for the formation of carbon monoxide (CO) from its elements at 298 K is : (R = 8.314 J K–1 mol–1)2006 · Shift 0 · Q3 · MCQ
  197. The enthalpy changes for the following processes are listed below : Cl2​(g) = 2Cl(g), 242.3 kJ mol–1 I2​(g) = 2I(g), 151.0 kJ mol–1 ICl(g) = I(g) + Cl(g), 211.3 kJ mol–1 I2​(s) = I2​(g), 62.76 kJ mol–1 Given that the…2006 · Shift 0 · Q4 · MCQ
  198. Consider the reaction: N2​ + 3H2​ → 2NH3​ carried out at constant temperature and pressure. If ΔH and ΔU are the enthalpy and internal energy changes for the reaction, which of the following expressions is true?2005 · Shift 0 · Q2 · MCQ
  199. If the bond dissociation energies of XY, X2​ and Y2​ (all diatomic molecules) are in the ratio of 1:1:0.5 and ΔHf​ for the formation of XY is -200 kJ mole-1. The bond dissociation energy of X2​ will be :2005 · Shift 0 · Q3 · MCQ
  200. Consider an endothermic reaction, X → Y with the activation energies Eb and Ef for the backward and forward reactions, respectively. In general :2005 · Shift 0 · Q4 · MCQ