Triple point is the point in
A substance expands on freezing only if
Correct Answer :- A
Explanation : A substance expands on freezing only if the slope of the fusion line on the pressure temperature chart is negative.
On a P-V-T surface, the triple point and critical point are seen as respectively
In the mollier diagram for steam, dryness fraction lines converge at
For a mixture of solid, liquid and vapour phases of a pure substance in equilibrium, what is the number of independent intrinsic properties needed ?
From Gibb's phase rule
C + 2 = P + F
For pure substance C= 1
Phases present, P - 3
1 + 2 = 3 + F
F = 0
Which one of the following represents the condensation of a mixture of saturated liquid and saturated vapour on the enthalpy-entropy diagram
For Moiller diagram, condensation takes place at constant pressure which is along vertically inclined.
Which of the following are pure substances?
1. Gaseous air
2. A mixture of gaseous air and liquid water
3. A mixture of liquid water and water vapour
4. A mixture of gaseous air and oil
Example of pure substance:
1. Atmospheric air
2. Steam water mixture
3. Combustion products of a fuel
The ordinate and abscissa in the given figure showing the saturated liquid and vapour regions of a pure substance represent.
Change of state, e.g., freezing, melting, evaporation and condensation, is an