“At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero”. This follows from the __________________?

Related Mcqs:

1. The absolute entropy for all crystalline substances at absolute zero temperature is ____________________?

   A. Zero
   B. Negative
   C. More than zero
   D. Indeterminate

2. Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is_______________?

   A. Superheated vapour
   B. Partially condensed vapour with quality of 0.9
   C. Saturated vapour
   D. Partially condensed vapour with quality of 0.1

3. A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1 is_________________?

   A. -1.87
   B. 0
   C. 1.26
   D. 3.91

4. At absolute zero temperature, the _____________ of the gas is zero?

   A. Pressure
   B. Volume
   C. Mass
   D. None of these

5. Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The ratio of chemical potential to free energy of a pure substance at constant temperature and pressure is________________?

   A. 0
   B. 1
   C. ∞
   D. None of these

6. Absolute zero temperature signifies the ____________________?

   A. Minimum temperature attainable
   B. Temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in
   C. Temperature of the heat reservoir to which a Carnot engine rejects no heat
   D. None of these

7. As the temperature is lowered towards the absolute zero, the value of the quantity (∂ΔF/∂T) approaches________________?

   A. Zero
   B. Unity
   C. Infinity
   D. None of these

8. As the temperature is lowered towards the absolute zero, the value of ∂(ΔF)/∂T, then approaches_______________________?

   A. Unity
   B. Zero
   C. That of the heat of reaction
   D. Infinity

9. Entropy of a substance remains constant during a/an ____________ change?

   A. Reversible isothermal
   B. Irreversible isothermal
   C. Reversible adiabatic
   D. None of these

10. The expression for entropy change, ΔS = n Cp . ln (T2/T1), is valid for the ______________ of a substance?

    A. Simultaneous pressure & temperature change
    B. Heating
    C. Cooling
    D. Both B. and C