CBSE  /  Class 11  /  Chemistry  /  Thermodynamics

  • 1. 
    Third law of thermodynamics provides a method to evaluate which property?

  • Absolute Energy
  • Absolute Enthalpy
  • Absolute Entropy
  • Absolute Free Energy

  • 2. 
    One mole of which of the following has the highest entropy?

  • Liquid Nitrogen
  • Hydrogen Gas
  • Mercury
  • Diamond

  • 3. 
    The enthalpy of vaporisation of a substance is 8400 J mol

  • 84 J mol
  • 21 J mol
  • 49 J mol
  • 12 J mol

  • 4. 
    The species which by definition has ZERO standard molar enthalpy of formation at 298 K is

  • Br
  • Cl
  • H
  • CH

  • 5. 
    In a reversible process the system absorbs 600 kJ heat and performs 250 kJ work on the surroundings. What is the increase in the internal energy of the system?

  • 850 kJ
  • 600 kJ
  • 350 kJ
  • 250 kJ

  • 6. 
    Which of the following is true for the reaction? H

  • ∆S = 0
  • ∆H = T ∆S
  • ∆H = ∆U
  • ∆H = 0

  • 7. 
    Calculate the heat required to make 6.4 Kg CaC2 from CaO(s) and C(s) from the reaction: CaO(s) + 3 C(s) → CaC2(s) + CO (g) given that ∆f Ho (CaC2) = -14.2 kcal. ∆f H° (CO) = -26.4 kcal.

  • 5624 kcal
  • 1.11 × 104 kcal
  • 86.24 × 10³
  • 1100 kcal

  • 8. 
    In a system where ∆E = -51. 0 kJ, a piston expanded against a p

  • -36 kJ
  • -13 kJ
  • -47 kJ
  • 24 kJ

  • 9. 
    A system absorb 10 kJ of heat at constant volume and its temperature rises from 270 C to 370 C. The value of ∆ U is

  • 100 kJ
  • 10 kJ
  • 0 kJ
  • 1 kJ

  • 10. 
    An ideal gas is taken around the cycle ABCA as shown in P-V diagram The next work done by the gas during the cycle is equal to:

  • 12P
  • 6P
  • 5P
  • P
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