Which of the following relations is correct for an adiabatic process?
  • P∆V = 0
  • ∆U = q
  • ∆q = 0
  • q = + w
A system absorbs 500 kJ heat and performs 250 kJ work on the surroundings. The increase in internal energy of the system is:
  • 250 kJ
  • 750 kJ
  • 500 kJ
  • 1000 kJ
The enthalpies of all elements in their standard states are
  • negative
  • zero
  • infinite
  • positive
If q amount of heat is supplied to a system, the work done by the system is w . What is the change in internal energy of the system?
  • ΔU = q - w
  • ΔU = q / w
  • ΔU = q + w
  • ΔU = q x w
The difference between heats of reaction at constant pressure and constant volume for the reaction:
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  • -3RT
  • R
  • 2RT
  • 2R
The internal energy of a system is
  • Kinetic as well as potential energy
  • Potential energy only
  • Unpredictable
  • Kinetic energy only
The process in which no exchange of heat takes place between system and surrounding is known as
  • Adiabatic process
  • Isothermal process
  • Isobaric process
  • Isochoric process
Evaporation of water is:
  • An exothermic change.
  • A process accompanied by chemical reaction.
  • An endothermic change.
  • A process in which no heat changes occur.
Which of the following is a state function?
  • Heat
  • Internal energy
  • Pressure
  • Volume
Tea placed in a closed vessel is an example of
  • isolated system
  • closed system
  • insulated system
  • open system
0 h : 0 m : 1 s

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