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

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  • A

    Solid into vapour

  • B

    Solid into liquid

  • C

    Liquid into vapour

  • D

    Vapour into liquid

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