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Unformatted text preview: 1 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 UNIT 6 CHEMICAL ENERGITICS Select the lettered item which best completes or answers each of the following : SECTION A 1. A thermodynamic is called a closed system (a) When only energy exchange with the surroundings is permitted (b) when the walls are adiabatic and exchange of neither energy nor matter with the surroundings is permitted (c) when exchange of both energy and matter are permitted (d) any of these 2. Any property whose magnitude is independent of the amount of substance present is calleda/an (a) colligative property (b) intensive property (c) extensive property (d) none of these 3. Which one of the following is not an intensive property ? (a) temperature (b) pressure (c) viscosity (d) energy 4. An example of an extensive property is (a) temperature (b) pressure (b) molar volume (d) enthalpy 5. Which of the following is not an intensive property ? (a) entropy (b) temperature (c) chemical potential (d) molar volume 6. A process in which no heat enters or leaves the system is called (a) isothermal (b) isobaric (c) adiabatic (d) isochoric 7. H and E are related as (a) H = E + P V (b) H = E + nRT (c) E = H P V (d) all of these 8. The difference between H and E at constant volume is equal to (a) R (b) p V (c) V p (d) R 2 3 9. Which of the following is incorrect ? (a) at constant volume, E = q (b) at constant volume, H = q p (c) for solids melting into a liquid, H = E (d) q r = q nRT 10. For an adiabatic process, which of following is true ? (a) q = 0 (b) w = E (c) temperature falls (d) all of these 11. Which of the following is always true for an adiabatic expansion of gas (ideal or real) ? (a) temperature rises (b) E = 0 (c) q = 0 (d) w = 0 12. Which of the following is not a state function ? (a) q + w (b) T H (c) E + PV (d) w q 13. For expansion of aperfect gas into vacuum, which is false ? (a) q = 0 (b) w = 0 (c) E and H = 0 (d) S = 0 14. For an ideal gas, (a) T p v = (b) T E v = (c) V E T = (d) T E p = 15. The Joule Thompson coefficient is defined as (a) H P T (b) p H T (c) p T H (d) p T P 16. If a gas absorbs 200 J heat and expands by 500 cm 3 against to constant pressure of 2 10 5 N m 2 , the change in internal energy is (a) 300 J (b) 100 J (c) 100 J (d) +300 J 17. When a gas expands against a finite pressure adiabatically, which is not true ? 2 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 (a) its internal entergy always decreases and temperature falls (b) its entropy always remains constant (c) q = 0 (d) E = w 18. Which of the following relationship is not based on the assumption of ideal gas...
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- Spring '11