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STD 11 - 10.1. thermonetry,thermal expansion and calorimetry — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 10.1. thermonetry,thermal expansion and calorimetry4 Marks
Question
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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