NEET Chemistry - New - Thermodynamics

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Question - 1

A reaction having equal energies of activation for forward and reverse reactions has:

  • A ∆S = 0
  • B ∆G = 0
  • C ∆H = 0
  • D ∆H = ∆G = ∆S = 0

Question - 2

Standard enthalpy of vaporisation ∆vap H0 for water at 100oC is 40.66 kJ mol-1. The internal energy of vaporization of water at 100oC (in kJ mol-1) is: (assume water vapour to behave like an ideal gas).

  • A +37.56
  • B -43.76
  • C +43.76
  • D +40.66

Question - 3

Which one of the following is correct option for free expansion of an ideal gas under adiabatic condition?

  • A q ≠ 0, ∆T = 0, W = 0
  • B q = 0, ∆T = 0, W = 0
  • C q = 0, ∆T = 0, W ≠ 0
  • D q = 0, ∆T ≠ 0, W = 0

Question - 4

Assume each reaction is carried out in an open container. For which reaction will ∆H = ∆E?

  • A H2(g) + Br2(g) ⟶ 2HBr(g)
  • B C(s) + 2H2O(g) ⟶ 2H2(g) + CO2(g)
  • C PCl5(g)  ⟶ PCI3(g) + CI2(g)
  • D 2CO(g) + O2(g) ⟶ 2CO2(g)

Question - 5

The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm, is:

  • A - 6 J
  • B - 608 J
  • C + 304 J
  • D - 304 J

Question - 6

For the reaction, C3H8(g) + 5O2(g) ⟶ 3CO2(g) 4H2O(l) at constant temperature, ∆H - ∆E is :

  • A + 3RT
  • B - RT
  • C + RT
  • D - 3RT

Question - 7

In a closed insulated container a liquid is stirred with a paddle to increase the temperature, which of the following is true?

  • A ∆E = ∆W ≠ 0, q = 0
  • B ∆E = W = 0, q ≠ 0
  • C ∆E =0, W = 0, q ≠ 0
  • D W =0, ∆E = 0, q ≠ 0

Question - 8

If, ∆E is the heat of reaction for C2H5OH(l) + 3O2(g) ⟶ 2CO2(g) + 3H2O(l) at constant volume, the ∆H (heat of reaction at constant pressure), then the correct relation is :

  • A ∆H = ∆E + RT
  • B ∆H = ∆E - RT
  • C ∆H = ∆E - 2RT
  • D ∆H = ∆E + 2RT

Question - 9

One mole of an ideal gas at 300 K is expanded isothermally from an initial volume of 1 L to 10 L. The ∆E for this process is (R = 2 cal mol-1 K-1) :

  • A 163.7cal
  • B zero
  • C 1381.1cal
  • D 8 L atm

Question - 10

For the reactions, N2 + 3H2  ⟶ 2NH3, ∆H = ?

  • A ∆E + 2RT
  • B ∆E - 2RT
  • C ∆H = RT
  • D ∆E - RT
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