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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...

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  1. open parentheses H subscript 2 end subscript minus H subscript 1 end subscript close parentheses represents the latent heat of fusion of the substance.    
  2. open parentheses H subscript 3 end subscript minus H subscript 1 end subscript close parentheses represents the latent heat of vaporization of the licquid.    
  3. BC represents the change of state from solid to liquid.    
  4. T subscript 2 end subscript is the melting point of the solid.    

    Answer:The correct answer is: open parentheses H subscript 2 end subscript minus H subscript 1 end subscript close parentheses represents the latent heat of fusion of the substance.

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