Q: The graph shows the variation of temperature (T) of one kilogram of a material with the heat (H) supplied to it. At O, the substance is in the solid state. From the graph, we can conclude that

(a) T_{2} is the melting point of the solid

(b) BC represents the change of state from solid to liquid

(c) (H_{2} – H_{1}) represents the latent heat of fusion of the substance

(d) (H_{3} – H_{1}) represents the latent heat of vaporization of the liquid

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Ans: (c)