A. The surface tension vanishes
B. Liquid and vapour have the same density
C. There is no distinction between liquid and vapour phases
D. All A, B. and C
Related Mcqs:
- Critical temperature is defined as the temperature above which a gas will____________________?
A. Not liquify (barring exceptions)
B. Immediately liquify
C. Never liquify however high the pressure may be
D. None of these - Cp of a gas at its critical temperature and pressure_______________?
A. Becomes zero
B. Becomes infinity
C. Equals 1 kcal/kmol °K
D. Equals 0.24 kcal/kmol °K - Critical compressibility factor for all substances___________________?
A. Are more or less constant (vary from 0.2 to 0.3)
B. Vary as square of the absolute temperature
C. Vary as square of the absolute pressure
D. None of these - A gas can be liquefied by pressure alone only, when its temperature is _____________ its critical temperature?
A. Less than
B. More than
C. Equal to or higher than
D. Less than or equal to - Any substance above its critical temperature exists as _____________________?
A. Saturated vapour
B. Solid
C. Gas
D. Liquid - Near their critical temperatures, all gases occupy volumes _____________ that of the ideal gas?
A. Less than
B. Same as
C. More than
D. Half - Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?
A. A homogeneous solution (say of phenol water) is formed
B. Mutual solubility of the two liquids shows a decreasing trend
C. Two liquids are completely separated into two layers
D. None of these - Which of the following is affected by the temperature ?
A. Fugacity
B. Activity co-efficient
C. Free energy
D. All A, B. & C - Sublimation temperature of dry ice (solid CO2) is ____________ °C?
A. -273
B. 0
C. -78
D. 5 - Fugacity is a measure of the____________________?
A. Escaping tendencies of the same substance in different phases of a system
B. Relative volatility of a mixture of two miscible liquids
C. Behaviour of ideal gases
D. None of these
