Thermodynamics and Thermochemistry 105 [Useful information : 1 J= 1kg m's-2, 1 Pa = 1 kg...

 

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Thermodynamics and Thermochemistry 105 [Useful information : 1 J= 1kg m's-2, 1 Pa = 1 kg m s; 1 bar 10° Pa] Given that AS (A +C) = 50 eu AS C + D) = 30 eu AS (D - B) = -20 euwhere, eu is entropy unit (a) 58001 bar (c) 14501 bar (b) 1450 bar (d) 29001 bar Then, AS (A → B) is (2006, 3M) (a) + 100 eu (b) +60 eu 23. One mole of an ideal gas at 300 K in thermal contact with surroundings expands isothermally from 1.0 L to 2.0 L against a constant pressure of 3.0 atm. (с) -100 eu (d) -60 eu In this process, the change in entropy of surroundings (AS surr) in JK' is (1 L atm = 101.3 J) 30. A monoatomic ideal gas undergoes a process in which the ratio of p to Vat any instant is constant and equals to 1. What is the molar heat capacity of the gas ? (2016 Adv.) (2006, 3M) 4R (a) 3R (b) 2 5R (c) (a) 5.763 (b) 1.013 (с) - 1.013 (d) – 5.763 (d) 0 24. The following reaction is performed at 298K 2NO(g)+ 02(g ) 2NO,(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 NO, (g) at 298 K? (K,=1.6x 102) (2015 Main) 31. One mole of monoatomic ideal gas expands adiabatically at initial temperature Tagainst a constant external pressure of 1 atm from 1L to 2 L. Find out the final temperature (R = 0.0821 L atm K- mol-) (2005, 1M) T (b) (2)5/3 -1 (a) T (a) R(298) In (1.6x 102)- 86600 (b) 86600+ R(298) In (1.6x 102) In (1.6x 1012) (d) T + 3x 0.082 3 x 0.082 (c) 86600- R(298) moles of an ideal gas expanded isothermally and eversibly from 1L to 10 L at 300 K. What is the enthalpy change? (a) 4.98 kJ (d) 0.5[2x 86600- R(298) In (1.6x 102 )] (2004, 1M) 25. For the process, H20(1) → H20 (g) at T = 100°C and 1 atmosphere pressure, the correct choice (b) 11.47 kJ (c) -11.47 kJ (d)0 kJ 33. Spontaneous adsorption of a gas on solid surface is an exothermic process because (a) AH increases for system (b) AS increases for gas (c) AS decreases for gas (а) AS >0 and AS surrounding O system (2004, 1M) (b) AS gystem >0 and AS gurrounding <0 (c) AS system <0 and AS, >0 (d) AG increases for gas surrounding (d) AS system < 0 and AS surrounding <0 34. One mole of a non-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, AE = 30.0L-atm. The change in enthalpy (AH) of the process in L-atm is (а) 40.0 (c) 44.0 (d) not defined, because pressure is not constant 35. Which of the following statements is false? Mea gas expands tmeljeelibrarý 26. A piston filled with 0.04 mole of an reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0°C. As it does so, it absorbs 208 J of heat. The values of q and W for the process will be (R = 8.314 J/mol K, In 7.5 2.01) (a) q = + 208 J, W =- 208 J (b) q =- 208 J, W = - 208J (c) q = - 208 J, W = + 208 J (d) q = + 208 J, W =+ 208 J (2002, 3M) (b) 42.0 (2013 Main) (2001, 1M) (a) Work is a state function (b) Temperature is a state function (c) Change in the state is completely defined when the initial and final states are specified (d) Work appears at the boundary of the system 27. For the process H,0(1)(1 bar, 373 K) → H,0(g) (1 bar, 373 K), the correct set of thermodynamic parameters is (a) AG = 0, AS = + ve (c) AG = + ve, AS = 0 (2007, 3M) (b) AG = 0, AS =- ve (d) AG = - ve, AS =+ ve 36. In thermodynamics, a process is called reversible when (2001, 1M) 28. The value of log 10 K for a reaction A B is (Given : A,H°298K =- 54.07 kJ mol (a) surroundings and system change into each other (b) there is no boundary between system and surroundings (c) the surroundings are always in equilibrium with the system (d) the system changes into the surroundings spontaneously 37. For an endothermic reaction, where AH represents the A,S°% °298 K = 10 JK- mol and R = 8.314 JK-'mol: 2.303 x 8.314 x 298=5705) (a) 5 (2007, 3M) (b) 10 (c) 95 (d) 100 29. The direct conversion of A to B is difficult, hence it is carried out by the following shown path enthalpy of the reaction in kJ/mol, the minimum value for the energy of activation will be (1992, 1M) (a) less than AH (c) more than AH (b) zero (d) equal to AH Thermodynamics and Thermochemistry 105 [Useful information : 1 J= 1kg m's-2, 1 Pa = 1 kg m s; 1 bar 10° Pa] Given that AS (A +C) = 50 eu AS C + D) = 30 eu AS (D - B) = -20 euwhere, eu is entropy unit (a) 58001 bar (c) 14501 bar (b) 1450 bar (d) 29001 bar Then, AS (A → B) is (2006, 3M) (a) + 100 eu (b) +60 eu 23. One mole of an ideal gas at 300 K in thermal contact with surroundings expands isothermally from 1.0 L to 2.0 L against a constant pressure of 3.0 atm. (с) -100 eu (d) -60 eu In this process, the change in entropy of surroundings (AS surr) in JK' is (1 L atm = 101.3 J) 30. A monoatomic ideal gas undergoes a process in which the ratio of p to Vat any instant is constant and equals to 1. What is the molar heat capacity of the gas ? (2016 Adv.) (2006, 3M) 4R (a) 3R (b) 2 5R (c) (a) 5.763 (b) 1.013 (с) - 1.013 (d) – 5.763 (d) 0 24. The following reaction is performed at 298K 2NO(g)+ 02(g ) 2NO,(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 NO, (g) at 298 K? (K,=1.6x 102) (2015 Main) 31. One mole of monoatomic ideal gas expands adiabatically at initial temperature Tagainst a constant external pressure of 1 atm from 1L to 2 L. Find out the final temperature (R = 0.0821 L atm K- mol-) (2005, 1M) T (b) (2)5/3 -1 (a) T (a) R(298) In (1.6x 102)- 86600 (b) 86600+ R(298) In (1.6x 102) In (1.6x 1012) (d) T + 3x 0.082 3 x 0.082 (c) 86600- R(298) moles of an ideal gas expanded isothermally and eversibly from 1L to 10 L at 300 K. What is the enthalpy change? (a) 4.98 kJ (d) 0.5[2x 86600- R(298) In (1.6x 102 )] (2004, 1M) 25. For the process, H20(1) → H20 (g) at T = 100°C and 1 atmosphere pressure, the correct choice (b) 11.47 kJ (c) -11.47 kJ (d)0 kJ 33. Spontaneous adsorption of a gas on solid surface is an exothermic process because (a) AH increases for system (b) AS increases for gas (c) AS decreases for gas (а) AS >0 and AS surrounding O system (2004, 1M) (b) AS gystem >0 and AS gurrounding <0 (c) AS system <0 and AS, >0 (d) AG increases for gas surrounding (d) AS system < 0 and AS surrounding <0 34. One mole of a non-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, AE = 30.0L-atm. The change in enthalpy (AH) of the process in L-atm is (а) 40.0 (c) 44.0 (d) not defined, because pressure is not constant 35. Which of the following statements is false? Mea gas expands tmeljeelibrarý 26. A piston filled with 0.04 mole of an reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0°C. As it does so, it absorbs 208 J of heat. The values of q and W for the process will be (R = 8.314 J/mol K, In 7.5 2.01) (a) q = + 208 J, W =- 208 J (b) q =- 208 J, W = - 208J (c) q = - 208 J, W = + 208 J (d) q = + 208 J, W =+ 208 J (2002, 3M) (b) 42.0 (2013 Main) (2001, 1M) (a) Work is a state function (b) Temperature is a state function (c) Change in the state is completely defined when the initial and final states are specified (d) Work appears at the boundary of the system 27. For the process H,0(1)(1 bar, 373 K) → H,0(g) (1 bar, 373 K), the correct set of thermodynamic parameters is (a) AG = 0, AS = + ve (c) AG = + ve, AS = 0 (2007, 3M) (b) AG = 0, AS =- ve (d) AG = - ve, AS =+ ve 36. In thermodynamics, a process is called reversible when (2001, 1M) 28. The value of log 10 K for a reaction A B is (Given : A,H°298K =- 54.07 kJ mol (a) surroundings and system change into each other (b) there is no boundary between system and surroundings (c) the surroundings are always in equilibrium with the system (d) the system changes into the surroundings spontaneously 37. For an endothermic reaction, where AH represents the A,S°% °298 K = 10 JK- mol and R = 8.314 JK-'mol: 2.303 x 8.314 x 298=5705) (a) 5 (2007, 3M) (b) 10 (c) 95 (d) 100 29. The direct conversion of A to B is difficult, hence it is carried out by the following shown path enthalpy of the reaction in kJ/mol, the minimum value for the energy of activation will be (1992, 1M) (a) less than AH (c) more than AH (b) zero (d) equal to AH