A solid material is supplied with heat at constant rate and the temperature of the material changes as shown below. From the graph, the false conclusion drawn is:

819-1188

  • A

    $AB$ and $CD$ of the graph represent phase changes

  • B

    $AB$ represent the change of state from solid to liquid

  • C

    latent heat of fusion is twice the latent heat of vaporization

  • D

    $CD$ represents the change of state from liquid to vapour

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[Neglect any heat loss to the surrounding.|

  • [IIT 2009]

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

A solid cube having certain fixed melting and boiling points takes heat from some source.The variation  of temperature $\theta$ of the cube with the heat supplied $Q$ is shown in the adjoining graph. The portion $BC$ of the graph represents the conversion of