For a thermodynamic system containing ‘x’ chemical species, the maximum number of phases that can co-exist at equilibrium is_________________?

Related Mcqs:

1. At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.) ?

   A. μ° + RT ln f
   B. μ°+ R ln f
   C. μ° + T ln f
   D. μ° + R/T ln f

2. For multi-component multiple phases to be in equilibrium at the same pressure and temperature, the _______________ of each component must be same in all phases?

   A. Chemical potential
   B. Fugacity
   C. Both A. and B
   D. Neither A. nor B

3. 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

4. Minimum number of phases that exists in a system is 1. Number of chemical species in a colloidal system is__________________?

   A. 1
   B. 2
   C. 3
   D. 4

5. The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are ?

   A. 1
   B. 2
   C. 3
   D. 0

6. The necessary and sufficient condition for equilibrium between two phases is_________________?

   A. The concentration of each component should be same in the two phases
   B. The temperature of each phase should be same
   C. The pressure should be same in the two phases
   D. The chemical potential of each component should be same in the two phases

7. The minimum number of phases that can exist in a system is________________?

   A. 0
   B. 1
   C. 2
   D. 3

8. At ____________ point, all the three phases (i.e. solid, liquid and gas) co-exist ?

   A. Eutectic
   B. Triple
   C. Plait
   D. Critical

9. The point at which all the three (solid, liquid and gas) phases co-exist, is known as the ____________ point?

   A. Freezing
   B. Triple
   C. Boiling
   D. Boyle

10. Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is__________________?

    A. 2
    B. 0
    C. 1
    D. 3