Change of state namely evaporation condensation, freezing and melting is an _______________ process?

Related Mcqs:

1. The freezing point of a liquid decreases when the pressure is increased, if the liquid ____________ while freezing?

   A. Contracts
   B. Expands
   C. Does not change in volume
   D. Either (A), B. or (C)

2. Specific ____________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.)?

   A. Entropy
   B. Internal energy
   C. Enthalpy
   D. Gibbs free energy

3. A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively) ?

   A. Δ S1 is always Δ SR
   C. Δ S1 is always > Δ SR
   D. Δ S1 is always = Δ SR

4. The melting point of paraffin wax (which contracts on solidification) _______________ with pressure rise?

   A. Increases
   B. Decreases
   C. Remains unchanged
   D. Decreases linearly

5. ____________ does not change during phase transformation processes like sublimation, melting & vaporisation?

   A. Entropy
   B. Gibbs free energy
   C. Internal energy
   D. All (A), B. & (C)

6. Melting of ice is an example of an _____________ process?

   A. Adiabatic
   B. Isothermal
   C. Isometric
   D. None of these

7. High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process ?

   A. Δ H = 0 and ΔS = 0
   B. Δ H ≠ 0 and ΔS = 0
   C. Δ H ≠ 0 and ΔS ≠ 0
   D. Δ H = 0 and ΔS ≠ 0

8. Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called ____________ solutions?

   A. Ideal
   B. Real
   C. Isotonic
   D. None of these

9. The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition?

   A. Internal energy
   B. Enthalpy
   C. Gibbs free energy
   D. Helmholtz free energy

10. The depression in freezing point of a solution is________________?

    A. Inversely proportional to the mass of solvent
    B. Directly proportional to the mole of solute
    C. Both A. and B.
    D. Neither A. nor B.