During the boiling of pure methanol at its normal boiling point
PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
During the boiling of pure methanol at its normal boiling point, the temperature of the liquid remains constant even though heat is continuously supplied. Which of the following statements best explains this observation?
(a) At the boiling point, the vapor pressure equals the external pressure, preventing any further increase in temperature.
(b) The latent heat supplied raises the temperature of the vapor phase only, leaving the liquid temperature unchanged.
(c) The heat supplied is used to overcome intermolecular attractions rather than increase the kinetic energy of the molecules.
(d) The average kinetic energy of the molecules cannot increase once the liquid reaches its boiling point.