Question

Consider the heating curve below. The graph represents temperature changes for a substance as heat is added at a steady rate. From the graph we would most likely conclude which of the following?

• A. The specific heat of the substance in the liquid phase is very small.
• B. The latent heat of fusion of the substance is very large.
• C. The latent heat of vaporization of the substance is very large.
• D. The latent heat of the substance is very small.
• E. The latent of vaporization of the substance is very small.

Answer 1

The correct option is C The latent heat of vaporization of the substance is very large.

When substance is heated at a steady rate, the temperature remains constant with time for a long time the second time it becomes constant.

The first horizontal line represents the solid-liquid transition and second one represents liquid-vapor transition.

Hence the latent heat of vaporization is large as compared to latent heat of fusion.