Thermodynamics | NEET Online Mock Test Leave a Comment / Blog / By admin 2 Sorry! Time up Thermodynamics - NEET (Chemistry) Best of Luck! 1 / 50 Find the set of intensive properties from the following statementsVapour pressure, specific heat and Dielectric constantE^{0}_{cell}, melting point and viscosityRefractive index, surface tension and molarityAll of these 1 2 3 4 2 / 50 2 mole of an ideal gas at 27°C expands isothermally and reversibly from a volume of 4L to 40L. The workdone (in KJ) by the gas is - -28.72 -11.48 -5.73 -4.98 3 / 50 Find the incorrect from the followingPCl_{5}(g) → PCl_{3}(g) + Cl_{2}(g) (△H = △E)2HI(g) → H_{2}(g) + l_{2}(g) (△H = △E)C(s) + H_{2}O(g) → CO(g) + H_{2}(g) (△H > △E)All of these 1 2 3 4 4 / 50 Which of the following is the correct option for free expansion of an ideal gas under adiabatic conditions?q = 0, △T = 0, w ≠ 0q = 0, △T = 0, w = 0q ≠ 0, △T ≠ 0, w ≠ 0q = 0, △T ≠ 0, w = 0 1 2 3 4 5 / 50 In which of the following reaction maximum amount of heat is evolved?HNO_{3}(aq) + NaOH (aq)CH_{3}COOH (aq) + NaOH (aq)HCI (aq) + NH_{4}OH (aq)HF (aq) + NaOH (aq) 1 2 3 4 6 / 50 If heat of formation (△H°) of C_{2}H_{4} and C_{2}H_{6} are x_{1} and x_{2} kcal mol-1 respectively, then heat of hydrogenation of C_{2}H_{4} isx_{1} + x_{2}x_{1} - x_{2}x_{2} - x_{1}x_{1} + 2x_{2} 1 2 3 4 7 / 50 Calculate the C-H bond energy if heat of atomization of C_{2}H_{6} is x kJ x/2 x/6 x/3 Data insufficient 8 / 50 Entropy decreases during Boiling of egg Rusting of iron Crystallisation of sucrose from solution (1) and (3) 9 / 50 Find the correct statement about surface tensionSI unit is Nm^{-1}The increase of temperature tends to decrease the surface tensionWork done per unit area is the surface energyAll of these 1 2 3 4 10 / 50 Select the incorrect statement Reversible process is very slow. Magnitude of expansion work done in reversible process is more than irreversible process. Both process (Reversible and irreversible) may be attained in equilibrium Irreversible process are imaginary process. 11 / 50 For the reaction, MCO_{3}(s) → MO(s) + CO_{2}(g); △H 82.8 kJ at 25°C, △E or △U at 25°C is 82.8 kJ 80.32 kJ -2394.77 kJ 85.28 kJ 12 / 50 If 50 calories are added to a system and the system does work of 30 calories on surroundings then the change in internal energy of the system is 20 cal 50 cal 40 cal 30 cal 13 / 50 Find the incorrect relation for the irreversible adiabatic process from the following:TV^{Y-1} = constantT^{Y}P^{1-Y}- constantPV^{Y} = constantAll of these 1 2 3 4 14 / 50 Bond dissociation enthalpy of H_{2}, Cl_{2} and HCI are 434, 242 and 435 kJmol^{-1} respectively. Enthalpy of formation of HCI is245 kJ mol^{-1}93 kJ mol^{-1}-245 kJ mol^{-1}-97 kJ mol^{-1} 1 2 3 4 15 / 50 Internal energy change (△U) when a monoatomic ideal gas is compressed reversibly from 16L to 2L at 300 K, is 600 Cal 1044.6 Cal 1200 Cal 0 Cal 16 / 50 The heat of formation of NH3(g) is - 46 kJ mol^{-1} The AH (in kJ mol^{-1}) of the reaction 2NH_{3}(g) → N_{2}(g) + 3H_{2}(g) is 46 -46 92 -30.2 17 / 50 In reversible adiabatic expansion of an ideal gas△S_{sys} = 0△S_{sys} > 0△S_{sys} < 0Data insufficient 1 2 3 4 18 / 50 For vaporization of water at 1 atmospheric pressure, the values of △H and △S are 40.63 kJ mol^{-1} and 108.8 JK-1mol^{-1} respectively. The temperature, when Gibbs energy change (△G) for this transformation will be zero, is 273.4 K 393.4 K 373.4 K 293.4 K 19 / 50 The molar heat of formation of NH_{4}NO_{3} (s) is - 367.5 kJ and those of N_{2}O(g) and H_{2}O(l) are +81.5 kJ and -286kJ respectively at 25°C and 1 atm. △U for decomposition of NH_{4}NO_{3}(s), into N_{2}O(g) and H_{2}O(l), is -65 kJ -125.5 kJ -33.5 kJ -200.5 kJ 20 / 50 The standard enthalpies of combustion of C_{3}H_{6}(l). C(graphite) and H_{2}(g) are respectively -3270, -394 and -286KJ respectively. The standard enthalpy of the formation of C_{3}H_{6}(l) in kJ mole^{-1} is 1230 -1230 -480 +480 21 / 50 For the reaction 2H_{2} + O_{2} → 2H_{2}O △H = -571 kJ mol^{-1}. Bond energies of H-H and O = O respectively are 435 and 498 kJ. Then average bond energy of the O-H bond will be (Approximately) 484 271 390 205 22 / 50 If 80 g NaOH reacts with 36.5 g HCI in dilute aqueous solution then the enthalpy of neutralisation is -13.6 kcal -27.2 kcal -6.8 kcal -54.4 kcal 23 / 50 What is the entropy change when 1 mole of a monoatomic ideal gas changes volume from 1L to 3L at constant temperature? (3R/2)ln3 (5R/2)ln3 3R ln3 R ln 3 24 / 50 Which one of the following is a wrong statement?△H_{f}^{o} for H^{+}(aq) is taken as zeroThe standard entropy of ethane is lower than that of methaneFor same initial P, V, T, the final temperature is less in adiabatic reversible expansion as compared to adiabatic irreversible expansion considering the final volume as the sameFor isothermal irreversible compression, △S_{sys} < 0 1 2 3 4 25 / 50 110J of heat are added to a gaseous system and its internal energy increases by 40J. The amount of workdone involved is 30J 40J 70J 80J 26 / 50 One mole of a monoatomic ideal gas at an initial temperature of T(K) does 6R joule of work adiabatically. The change in temperature is ((C_{p}/C_{v}) = 72) 2 3 4 5 27 / 50 The combustion of glucose takes place asC_{6}H_{12}O_{6} +6O_{2} → 6CO_{2}+6H_{2}O, △H = x kcal mol^{-1}The energy released by the combustion of 1.6g of glucose is -0.64 kcal. What is the value of x?-80 kcal mol^{-1}-72 kcal mol^{-1}+72 kJ mol^{-1}-108 kcal mol^{-1} 1 2 3 4 28 / 50 Heat of hydrogenation of cyclohexene is -x KJ. If the heat of hydrogenation of benzene is -z then what would be the resonance energy of benzene? z + 3x z - 3x 2x - z 3x - z/2 29 / 50 Calculate amount of work done when 2 mole of an ideal gas present in a vessel of 2L capacity at 1 atm pressure is allowed to enter into an evacuated vessel of 10L capacity 16 Joule 16 101.3 Joule 12 x 101.3 Joule Zero 30 / 50 One mole of ideal gas is adiabatically and reversibly compressed to 1/4th of its original volume. Change in temperature of the gas if initial temperature is 27°C (given γ = 1.66) 100 k 200 k 449 K 350 k 31 / 50 Calculate the enthalpy change for the following reactionCH_{4}(g) + 2O_{2}(g) → CO_{2}(g) + 2H_{2}O(l)Given enthalpies of formation of CH_{4}, CO_{2} and H_{2}O are -74.8 kJ/mole, -393.5 kJ/mole and -286.2 kJ/mole respectively 891.1 kJ -891.1 kJ -923.1 kJ 923.1 kJ 32 / 50 On combustion carbon forms two oxide CO and CO_{2} Heat of formation of CO_{2} is -94.3 Kcal and that of CO is -26.0 Kcal. Heat of combustion of carbon is -68.3 Kcal -120.3 Kcal -26.0 Kcal -94.3 Kcal 33 / 50 For which of the following AH, is not zero ?Br_{2}(e)P_{4}(white)C(diamond)S_{8}(Rhombic) 1 2 3 4 34 / 50 The temperature at which the reactionAg_{2}O(s) 2Ag(s) + 1/2 O_{2}(g)is at equilibrium is (Given, △H° 30.5 kJ/mole △S° 0.066 kJ/mole K^{-1}) 263.12 K 462.12 K 642.12 K 246.12 K 35 / 50 Which of the following statement is/are correct regarding third law of thermodynamics?Third law of thermodynamics deals with entropy of perfect crystalline substance which is taken as zero at absolute zero temperatureThe entropy of solid or liquid approaches zero at 0^{o}CThe residual entropy of CO is 5 JK^{-1} mol^{-1} a b c Both 'a' and 'c' 36 / 50 The enthalpy of dissociation of CH_{4}(g) and C_{2}H_{6}(g) are 360 kcal and 620 kcal respectively. The bond energy of the C-C bond is 100 Kcal 95 Kcal 90 Kcal 80 Kcal 37 / 50 The difference between heat of reaction at constant pressure and constant volume for the reaction,C(s) + 1/2O_{2}(g) --> CO_{2}(g) at 300 K is energies Given: R = 0.002 Kcal 300 Cal 400 Cal 900 Cal 600 Cal 38 / 50 A thin evacuated glass bulb of 100 mL capacity was there inside a 2-litre container at 27°C and 800 mm Hg pressure. If the bulb is broken isothermally, The new pressure in the container is 800 mm Hg 40 mm Hg 760 mm Hg 840 mm Hg 39 / 50 A gas at a pressure of 6 bar is heated from 0°C to 546°C and simultaneously compressed to half of its original volume. Final pressure is 45 bar 36 bar 63 bar 54 bar 40 / 50 The standard molar heat of formation of ethane, CO_{2} (g) and H_{2}O(l), is respectively -21.1, -94.1 and-68.3 kcal mol^{-1}. The standard molar heat of , combustion (in kcal mol^{-1}) of ethane will be -372 162 -240 184 41 / 50 If the standard heat of hydrogenation of but 1-ene is - x kJ/mole and that of Buta -1, 3-diene is -y kJ/mole, then the resonance energy of Buta-1, 3- diene is x + y x - y y - 2x 2x - 2y 42 / 50 The total entropy change for a reversible cyclic process Always increases Zero Decreases Depends on the path 43 / 50 If a gas is contracted at constant temperature Kinetic energy of molecules increases Kinetic energy of molecular decreases Kinetic energy of molecules remain same Number of molecules of gas decreases 44 / 50 One mole of gas occupying 2dm³ expands against a constant external pressure of 1.5 atm to a volume of 12 dm³. The work done is-10 atm dm³-15 atm dm³-5 atm dm³-18 atm dm³ 1 2 3 4 45 / 50 Which of the following is correct for an ideal gas undergoing adiabatic expansion in a vacuum?△U = 0△T = 0W = 0All of these 1 2 3 4 46 / 50 The bond dissociation energy of C-H bond in CH_{4} from given equation isC(g) + 4H(g) → CH_{4}(g), △H = -397.8 kcal -99.45 kcal 397.8 kcal 99.45 kcal -397.8 kcal 47 / 50 Which of the following is correct for the adiabatic reversible process?△S_{sys }= 0△S_{sys >} 0△S_{sys <} 0△S_{sys }= 1 1 2 3 4 48 / 50 Select extensive property from the following Volume Density Refractive index Pressure 49 / 50 The enthalpy of combustion of solid benzoic acid at constant volume is - x kJ at 27°C, Its enthalpy of combustion (in kJ) at constant pressure will be - x + 300 R - x - 300 R - x -150 R - x + 600 R 50 / 50 If 84 J of heat energy is given to a system and work done by the system is 5 cal, then the amount of internal energy change for the system will be Can't be calculated Increased by 0.063 kJ Decreased by 63 J Increased by 25 cal Your score is The average score is 16% 0% Restart quiz NEXT CHAPTER: Equilibrium