JEE Questions for Chemistry Thermodynamics Quiz 5 - MCQExams.com

The heat required to raise the temperature of a body by 1K is called
  • specific heat
  • thermal capacity
  • water equivalent
  • none of these
Under the same conditions how many ml of 1 M KOH and 0.5 H2SO4 solutions, respectively, when mixed to form a total volume of 100 ml. produce the highest rise in temperature.
  • 67, 33
  • 33, 67
  • 40 , 60
  • 50, 50
Enthalpy of neutralisation of HCl with NaOH is x. The heat evolved when 500 ml of 2 NHCl are mixed with 250 ml of 4 N NaOH will be
  • 500 x
  • 100 x
  • x
  • 10 x
The enthalpy of dissolution of BaCl2(s) and BaCl2. 2 H2O (s) are -20.6 and 8.8 kJ mol-1 respectively. The enthalpy of hydration for BaCl2(s) + 2 H2O → BaCl2.2H2O (s) is
  • 29.4 kJ
  • -29.4 kJ
  • -11.8 kJ
  • 38.2 kJ
The heats of combustion of rhombic and monoclinic Sulphur are respectively 70960 and 71030 calories. What will be the heat of conversion of rhombic Sulphur to monoclinic?
  • 70960 calories
  • 71030 calories
  • – 70 calories
  • + 70 calories

Chemistry-Thermodynamics-8717.png
  • 524.1
  • 41.2
  • ‒262.5
  • ‒41.2
The enthalpies of formation of N2O and NO are 82 and 90 kJ/ mole respectively.The enthalpy of the reaction 2N2O(g) + O2(g) → 4NO(g) is equal to
  • 8 kJ
  • 88 kJ
  • -16 kJ
  • 196 kJ
Based on the following thermochemical equations
Chemistry-Thermodynamics-8720.png
  • ‒ 393 kJ
  • ‒ 655 kJ
  • +393 kJ
  • +655 kJ
The standard heat of formation in kcal/mole of NO2 (g) and N2O4(g) are 8.0 and 2.0 respectively. The heat of dimerisation of NO2 i.e. for 2 NO2 (g) N2O4(g) in kcal is
  • 10.0
  • – 6.0
  • – 12.0
  • – 14.0
The enthalpy of vaporization of liquid water using the data
Chemistry-Thermodynamics-8722.png
  • +43.93 kJ/mol
  • ‒ 43.93 kJ/mol
  • + 527.61 kJ/mol
  • ‒ 527.61 kJ/mol
The enthalpy changes at 298 K in successive breaking of O-H bonds of HOH are
Chemistry-Thermodynamics-8723.png
  • 498 kJ mol-1
  • 463 kJ mol-1
  • 428 kJ mol-1
  • 70 kJ mol-1
The bond energy of an O-H bond is 109 kcal mol-1. When a mole of water is formed
  • 218 kcal is released
  • 109 kcal is released
  • 218 kcal is absorbed
  • 109 kcal is absorbed
One mole of an ideal gas at 300 K is expanded isothermally from an initial volume of 1 litre to 10 litres. The ∆E for this process is (R = 2 cal mol-1 K-1)
  • 163.7 cal
  • zero
  • 1381.1 cal
  • 9 lit atom
Given the reaction at 1240 K and 1 atm.
CaCO3(s) → CaO(s) + CO2(g), ΔH = 176 kJ/mol, the ΔE equals
  • 160.0 kJ
  • 165.6 kJ
  • 186.4 kJ
  • 180.0 kJ
The latent heat of vaporisation of a liquid at 500 K and 1 atm. pressure is 10.0 kcal /mol. What will be the change in internal energy of 3 moles of the liquid at the same temperature and pressure ?
  • 27.0 kcal
  • 13.0 kcal
  • ‒ 27.0 kcal
  • ‒ 13.0 kcal
2 mole of an ideal gas at 27oC temperatures is expanded reversibly from 2 lit. to 20 lit. Find entropy change (R = 2 cal/ mol K)
  • 92.1
  • 0
  • 4
  • 9.2
What percent T1 is of T2 for a heat engine whose efficiency is 10% ?
  • 80%
  • 90%
  • 10%
  • 100%
One mole of a non-ideal gas undergoes a change of state (2.0 atm, 3.0L, 95 K) → (4.0 atm, 5.0 L, 245 K) with a change in internal energy, ∆U = 30.0L atm. The change in enthalpy (∆H) of the process in L atm is
  • 40.0
  • 42.3
  • 44.0
  • not defined, because pressure is not constant
The table given below lists the bond dissociation energy (Ediss) for single covalent bonds formed between C and atoms A, B, D and E.
Chemistry-Thermodynamics-8729.png
  • D
  • E
  • A
  • B
Heat of neutralisation of NaOH and HCl is – 57.3 kJ mol-1. The heat of ionization of water will be
  • ‒ 57.3 kJ mol-1
  • ‒ 114.6 kJ mol-1
  • +57.3 kJ mol-1
  • +114.6 kJ mol-1

Chemistry-Thermodynamics-8731.png
  • q = 0
  • T2 = T1
  • p2 V2 = p1 V1
  • All the above

Chemistry-Thermodynamics-8732.png
  • T1 = T2
  • T3 > T1
  • Wadiabatic > Wisothermal
  • ∆Uadiabatic > ∆Uisothermal
An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If Ti is the initial temperature and Tf is the final temperature, which of the following statements is correct ?
  • ( Tf )irrev > ( Tf )rev
  • Tf > Ti for reversible process but Tf = Ti for irreversible process
  • ( Tf )rev = ( Tf )irrev
  • Tf > Ti for both reversible and irreversible process

Chemistry-Thermodynamics-8733.png
  • q - v + 2x
  • q + v - 2x
  • q + v + 2x
  • q + 2v - 2x
When one mole of monoatomic ideal gas at TK undergoes adiabatic change under a constant external pressure of 1 atm changes volume from 1 L to 2 L. The final temperature in Kelvin would be

  • Chemistry-Thermodynamics-8734.png
  • 2)
    Chemistry-Thermodynamics-8735.png
  • T

  • Chemistry-Thermodynamics-8736.png
In which one of the following cases, the heat of neutralization is minimum?
  • Neutralization of NH4OH with HCl
  • Neutralization of NaOH with CH3COOH
  • Neutralization of NaOH with HNO3
  • Neutralization of NH4OH with CH3COOH
For the complete combustion of ethanol, C2H5OH (l) + 3O2(g) → 2CO2(g)+ 3H2O (l) , the amount of heat produced as measured in bomb calorimeter, is 1364.47 kJ mol-1 at 25°C. Assuming ideality the enthalpy of combustion, ∆HC , for the reaction will be (R = 8.314 JK-1 mol-1 )
  • - 1366.95 kJ mol-1
  • - 1361.95 kJ mol-1
  • - 1460.50 kJ mol-1
  • - 1350.50 kJ mol-1
For which of the following equations is the change in enthalpy at 25°C and 1 atm equal to ∆H°f of CH2O (l)

  • Chemistry-Thermodynamics-8737.png
  • 2)
    Chemistry-Thermodynamics-8738.png

  • Chemistry-Thermodynamics-8739.png

  • Chemistry-Thermodynamics-8740.png
A sample of liquid in a thermally insulated container is stirred for 1 h by a mechanical attachment to a motor in the surroundings, which of the following thermodynamic quantity for the system is zero ?
  • Work (W)
  • Change in internal energy (∆E)
  • Change in enthalpy (∆H )
  • None of the above
In a constant volume calorimeter, 3.5 g of a gas with molecular weight 28 was burnt in excess oxygen at 298.0 K. The temperature of the calorimeter was found to increase from 298.0 K to 298.45 K, due to the combustion process. Given, that the heat capacity of the calorimeter is 2.5 kJ K-1, the numerical value for the enthalpy of combustion of the gas in kJ mol-1 is
  • 7
  • 9
  • 0
  • 8

Chemistry-Thermodynamics-8741.png
  • - 148 kcal
  • + 54 kcal
  • - 54 kcal
  • + 80 kcal

Chemistry-Thermodynamics-8742.png
  • - 393
  • + 393
  • + 655
  • - 655

Chemistry-Thermodynamics-8743.png
  • ( 2x + y )
  • ( x + y )

  • Chemistry-Thermodynamics-8744.png
  • ( y - 2x )
  • ( 2x - y )

Chemistry-Thermodynamics-8745.png
  • - 1802 kJ
  • + 1802 kJ
  • + 237 kJ
  • - 800 kJ

Chemistry-Thermodynamics-8746.png
  • + 250 kJ
  • - 250 kJ
  • + 125 kJ
  • - 125 kJ
The decreasing order of bond dissociation energies of C—C, C—H and H—H bonds is

  • Chemistry-Thermodynamics-8747.png
  • 2)
    Chemistry-Thermodynamics-8748.png

  • Chemistry-Thermodynamics-8749.png

  • Chemistry-Thermodynamics-8750.png

Chemistry-Thermodynamics-8751.png
  • ∆E + 2RT
  • ∆E - 2RT
  • ∆E + RT
  • ∆E - RT
A monoatomic ideal gas undergoes a process in which the ratio of P to V at any instant is constant and equals to 1. What is the molar heat capacity of the gas?

  • Chemistry-Thermodynamics-8753.png
  • 2)
    Chemistry-Thermodynamics-8754.png

  • Chemistry-Thermodynamics-8755.png
  • 0

Chemistry-Thermodynamics-8756.png
  • the dissociation energy of H2 and enthalpy of sublimation of carbon
  • latent heat of vaporisation of methane
  • the first four ionisation energies of carbon and electron gain enthalpy of hydrogen
  • the dissociation energy of hydrogen molecule, H2
The standard molar heat of formation of ethane, CO2 and water (l) are - 21.1, - 94.1 and - 68.3 kcal, respectively. The standard molar heat of combustion of ethane will be
  • -372 kcal
  • 162 kcal
  • -240 kcal
  • 183.5 kcal
Heat of neutralisation will be minimum for which of the following combination ?
  • NaOH + H2 SO4
  • NH4 OH + CH3 COOH
  • NaOH + HCl
  • NaOH + CH3 COOH
When 50 cm3 of 0.2 N H2 SO4 is mixed with 50 cm3 of 1 N KOH, the heat liberated is
  • 11.46 kJ
  • 157.3 kJ
  • 573 kJ
  • 573 J
In which of the following reactions, the heat liberated is known as heat of combustion ?
  • H+ (aq) + OH - (aq) → H2 O ( l ) + heat
  • 2)
    Chemistry-Thermodynamics-8757.png
  • CH4 (g) + 2O2 (g) → CO2(g) + 2H2O ( l ) + heat
  • H2 SO4 (aq) + H2O ( l ) → H2 SO4 (aq) + heat
For the following two reactions,
(i) CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O ; ∆H = - 890.4 kJ
(ii) 2HgO(s) → 2Hg( l ) + O2 (g); ∆H = + 181.6 kJ
Which one of the following statements is correct ?
  • Both of them are exothermic
  • Both of them are endothermic
  • (i) is exothermic and (ii) is endothermic
  • (i) is endothermic and (ii) is exothermic

Chemistry-Thermodynamics-8758.png
  • - 26.7 kcal
  • + 26.7 kcal
  • - 52.4 kcal
  • + 52.4 kcal

Chemistry-Thermodynamics-8759.png
  • - 814.4 kJ
  • + 320.5 kJ
  • - 650.3 kJ
  • -933.7 kJ

Chemistry-Thermodynamics-8760.png
  • - 227.2 kJ
  • - 272.3 kJ
  • 227.2 kJ
  • 272.3 kJ
The enthalpies of formation of Al2 O3 and Cr2 O3 are - 1596 kJ and - 1134 kJ respectively. ∆H for the reaction,
2Al + Cr2 O3 →2Cr + Al2O3 is
  • - 2730 kJ
  • - 462 kJ
  • - 1365 kJ
  • + 2730 kJ

Chemistry-Thermodynamics-8761.png
  • 484
  • - 484
  • 271
  • - 271
A substance is carried out through the following transformations.
The equations ∆S1 + ∆S2 = ∆S3 + ∆S4 + ∆S5
Chemistry-Thermodynamics-8762.png
  • is true only if the steps are carried out reversibly
  • is always true because entropy is a state function
  • may be true but need more informations on the processes
  • is incorrect
0:0:1


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