1. For the reaction C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(I) at constant temperature ∆H – ∆E is

2. In which of the following process, a maximum increase in entropy is observed?

3. Which of the following is true for the reaction? H₂O (l) ↔ H₂O (g) at 100° C and 1 atm pressure

4. One mole of a hon-ideal gas undergoes a change of state (2.0 atm, 3.0 L, 95 K) → (4.0 atm, 5.0 L, 245 K) with a change in internal energy, ∆U = 30.0 L atm. The change in enthalpy (∆H) of the process in L atm is

5. Which one of the following statement is false?

6. The amount of the heat released when 20 ml 0.5 M NaOH is mixed with 100 ml 0.1 M HCl is x kJ. The heat of neutralization is

7. The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283.0 kJ mol^-1 respectively. The enthalpy of formation of carbon monoxide is:

8. The temperature of the system decreases in an ______.

9. Standard enthalpy of vapourisation ΔH_vap for water at 100oC is 40.66 kJmol^-1. The internal energy of vapourisation of water at 100°C (in kJmol^-1) is (Assume water vapour to behave like an ideal gas)

10. Calculate the heat required to make 6.4 Kg CaC₂ from CaO(s) and C(s) from the reaction: CaO(s) + 3 C(s) → CaC₂(s) + CO (g) given that ∆_f Ho (CaC₂) = -14.2 kcal. ∆_f H° (CO) = -26.4 kcal.

11. The heat required to raise the temperature of a body by 1 K is called

12. One gram of sample of NH₄NO₃ is decomposed in a bomb calorimeter. The temperature of the calorimeter increases by 6.12 K. The heat capacity of the system is 1.23 kj/deg. What is the molar heat of decomposition of NH₄NO₃?

13. A system absorb 10 kJ of heat at constant volume and its temperature rises from 270°C to 370°C. The value of ∆ U is

14. Which of the following reactions is endothermic?

15. Based on the first law of thermodynamics, which one of the following is correct?

16. The pressure-volume work for an ideal gas can be calculated by using the expression w= ʃPexdv. The work can also be calculated from the pV– a plot by using the area under the curve within the specified limits. When an ideal gas is compressed (a) reversibly or (b) irreversibly from volume Vi to Vf. choose the correct option.

17.  Thermodynamics is not concerned about______.

18. Which of the following salts will have maximum cooling effect when 0.5 mole of the salt is dissolved in same amount of water. Integral heat of solution at 298 K is given for each salt?

19. The third law of thermodynamics provides a method to evaluate which property?

20. In a system where ∆E = -51.0 kJ, a piston expanded against a p_ext of 1.2 atm giving a change in volume of 32.0 L. What was the change in heat of this system?