Question

Heat is supplied to a certain homogeneous sample of matter at a uniform rate. Its temperature is plotted against time, as shown. Which of the following conclusion can be drawn?

• A. Its specific heat capacity is greater in the solid state than in liquid state.
• B. Its specific heat capacity is greater in the liquid state than in the solid state.
• C. Its latent heat of vaporization is greater than its latent heat in fusion.
• D. Its latent heat of vaporization is smaller than its latent heat in fusion.

Answer 1

Answer: (B), (C)

Its specific heat capacity is greater in the liquid state than in the solid state.
Its latent heat of vaporization is greater than its latent heat in fusion.

The horizontal parts of the curve, where the system absorbs heat at constant temperature, must depict changes of state. Here the latent heats are proportional to the lengths of the horizontal parts. In the sloping parts, specific heat capacity is inversely proportional to the slopes.

Also we can see from the slope of curve , for solid state its higher ,means rate of rise of temperature is quite higher as compared to liquid state.