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Thermodynamics Book Back Questions

11th Standard

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  1. The amount of heat exchanged with surrounding at constant temperature pressure is given by the quantity ______________

    (a)

    ΔE

    (b)

    ΔH

    (c)

    ΔS

    (d)

    ΔG

  2. In an adiabatic process, which of the following is true ?

    (a)

    q = w

    (b)

    q = 0

    (c)

    ΔE = q

    (d)

    PΔV= 0

  3. An ideal gas expands from the volume of 1 x 10-3 m3 to 1 x 10-2 m3 at 300 K against a constant pressure at 1 x 105 Nm-2. The work done is ______________

    (a)

    - 900 J

    (b)

    900 kJ

    (c)

    270 kJ

    (d)

    -900 kJ

  4. The heat of formation of CO and CO2 are - 26.4 kcal and - 94 kcal, respectively. Heat of combustion of carbon monoxide will be ____________

    (a)

    + 26.4 kcal

    (b)

    - 67.6 kcal

    (c)

    - 120.6 kcal

    (d)

    + 52.8 kcal

  5. The enthalpies of formation of Al2O3 and Cr2Oare -1596 kJ and -1134 kJ, respectively. ΔH for the reaction 2AI + Cr2O3 ⟶ 2Cr + Al2O3 is _______________

    (a)

    - 1365 kJ

    (b)

    2730 kJ

    (c)

    - 2730 kJ

    (d)

    - 462 kJ

  6. 3 x 2 = 6
  7. State the first law of thermodynamics.

  8. Define Gibb's free energy.

  9. What is lattice energy?

  10. 3 x 3 = 9
  11. 1 mole of an ideal gas, maintained at 4.1 atm and at a certain temperature, absorbs heat 3710 J and expands to 2 litres. Calculate the entropy change in expansion process.

  12. The standard enthalpies of formation of SO2 and SO3 are -297 kJ mol-1 and -396 kJ mol-1 respectively. Calculate the standard enthalpy of reaction for the reaction: SO2 + \(\frac{1}{2}\)O2⟶SO3

  13. For the reaction at 298 K: 2A +B ⟶ C.  ΔH = 400 J mol-1; ΔS = 0.2 JK-1 mol-1 Determine the temperature at which the reaction would be spontaneous.

  14. 2 x 5 = 10
  15. Explain how heat absorbed at constant volume is measured using bomb calorimeter with a neat diagram.

  16. List the characteristics of Gibbs free energy

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