Question

A piece of ice is heated at a constant rate. The variation in temperature with time of heating is shown in the graph (see fig.)
(i) What is represented by AB?
(ii) What does CD represent?
(iii) What conclusion can you draw regarding the nature of ice from the graph below?

Answer 1

i.AB represents the change of state from solid to liquid i.e., AB represents melting of ice at 0°C.
ii.CD represents the change of state from liquid to vapour i.e., CD represents boiling of water at 100°C.
iii.The ice initially is in solid state at -10°C. On heating, its temperature rises to 0°C. It then takes some heat at 0°C to melt in water at 0°C which is its latent heat.