Thermodynamics mcqs.pptx

1. THERMODYNAMICS Which of the following does NOT result in an increase in entropy? a. Crystallization of sugar from solution. b. Dissolution of common salt in water. c. Conversion of ice to water. d. Vaporization of camphor.

2. Which of the following is CORRECT?  a. Q is a path function.  b. Qp is a path function.  c. G is a path function.  d. S is a path function.

3. What is the value of Δng in the formation of acetaldehyde from its constituent elements?  a) -2 b) -1  c) -2.5 d) 0

4. Identify the intensive properties from the following.  a) Volume and temperature  b) Specific heat and volume  c) Temperature and melting point  d) Heat capacity and temperature

5. Which of the following is a state function as well as intensive property?  a) Internal energy b) Volume  c) Heat capacity d) Temperature

6. An adiabatic process is one in which -----.  a. all energy is transferred as heat  b. volume of the system remains constant  c. there is no exchange of heat between the system and its surroundings  d. pressure of the system remains constant

7. According to thermodynamics, the universe is defined as -------.  a) surroundings b) system - surroundings  c) system d) system + surroundings

8. 8. The intensive property among the following quantities is ------ .  a) volume b) mass  c) density d) heat capacity

9. The heats of vaporization of H2O, C2H5OH and CS2 are 40.6 kJ mol- 1, 38.6 kJ mol-1 and 26.8 kJ mol-1 respectively. The strength of intermolecular forces in these liquids is in the order of ------.  a) CS2 > C2H5OH > H2O  b) H2O > C2H5OH > CS2  c) CS2 > H2O > C2H5OH  d) H2O > CS2 > C2H5OH

10. The combustion of benzene(l) gives CO2(g) and H2O(l). Given that heat of combustion of benzene at constant volume is -3263.9 kJ mol-1 at 25°C, heat of combustion (in kJ mol-1) of benzene at constant pressure will be -----. (R = 8,314 J K-1 mol-1)  a) -3267.6 b) 3260  c) 4152.6 d) -452.46

11.  Identify the INCORRECT statement.  a. In mechanics, work done by a body is the product of force and displacement.  b. In the reaction between NH3(g) and HCl(g) carried out in a cylinder equipped with a frictionless movable piston, as the reaction proceeds the piston moves down.  c. Pressure is defined as force per unit volume.  d. In the decomposition of H2O2(l) carried out in a cylinder equipped with frictionless movable piston, the gas produced pushes the piston upwards.

12. One Joule is equal to ------.  a) 105 Pa m3 b) 10 Pa m3  c) 4.184 Pa m3 d) 1 Pa m3

13. The constant external pressure required to compress 1 mole of an ideal gas from 23 dm3 to 8 dm3 when work obtained is 9.09 kJ at 27 °C is ------.  a) 0.606 bar b) 60.6 bar  c) 6.06 bar d) 6.60 bar

14. 3 moles of an ideal gas is compressed from 30 dm3 to 20 dm3 against a constant pressure of 3.039 bar. The work done in calories is ------. (1 J = 0.239 cal)  a) +726.3 cal b) +303.9 cal  c) + 30.39 cal d) + 72.63 cal

15. 2 moles of H2 at 5 atm. expanded isothermally and reversibly at 57 °C to 1 atm. Work done is ------.  a) - 2.303 × 8.314 × 330 × log10 1 2 J  b) - 2.303 × 8.314 × 660 × log10 1 5 J  c) - 2.303 × 8.314 × 330 × log10 5 J  d) - 2.303 × 8.314 × 660 × log10 5 J

16. If the same amounts of each of the four gases were taken, on expanding from a volume V1 to V2, the maximum work will be done in the case of ------.  a) O2 b) CH4  c) CO2 d) N2

17. The work done when 1.6 × 10-2 kg of oxygen at 300 K are expanded isothermally and reversibly, till its volume is tripled is -----. (log 3 = 0.4771, R = 8.314 J K-1 mol-1)  a) - 1.370 kJ b) -646.4 kJ  c) - 0.6464 kJ d) - 864.5 kJ

18. The internal energy change when a system goes from state A to B is 40 kJ/mole. If the system goes from A to B by a reversible path and returns to state A by an irreversible path what would be the net change in internal energy?  a) Zero b) > 0 kJ  c) 40 kJ d) < 40 kJ

19. For a particular reaction, the system absorbs 5 kJ of heat and does 2 kJ of work on its surroundings. What is the change in internal energy?  a) + 7 kJ b) + 3 kJ  c) - 3 kJ d) - 7 kJ

20. For reaction; Ag2O(s) 2Ag(s) + 1 2 O2(g), the value of ΔH = 30.56 kJ mol-1 and ΔS = 0.06 kJ K-1 mol-1. The temperature at which free energy change for the reaction will be zero is ------.  a) 693 K b) 373 K  c) 413 K d) 509 K

21. How internal energy will change due to the removal of heat and work from the system?  a) decrease b) remain same  c) increase d) none

22. Which of the following processes has no change in the internal energy?  a) Isobaric b) Adiabatic  c) Isochoric d) Isothermal

23. In a closed insulated container, a liquid is stirred with a paddle to increase its temperature. In this process, which of the following is TRUE?  a. ΔU = W = Q = 0  b. ΔU ≠ 0, Q = W = 0  c. ΔU = W ≠ 0, Q = 0  d. ΔU = Q ≠ 0, W = 0

Thermodynamics mcqs.pptx

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