The graph shows the variation of temperature \( (T) \) of one kilogram of a material with the he...

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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) \( B C \) represents the change of state from solid to liquid
(c) \( \left(\mathrm{H}_{2}-\mathrm{H}_{1}\right) \) represents the latent heat of fusion of the substance
(d) \( \left(\mathrm{H}_{3}-\mathrm{H}_{1}\right) \) represents the latent heat of vaporization of the liquid
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