The heating curve of a particular substance in solid state is as shows in the figure.Choose the correct alternative

The change of state in the graph is represented by ________part.

The heating curve of a particular substance in solid state is as shown in the figure .choose the correct alternative The change of state in the graph is represented by ________part.

The heating curve of a paritcular substance in solid state is as shown in the figure .choose the correct alternative The porition QR of the graph indicates

The heating curve of a particular substance in solid state is as shows in the figure.Choose the correct alternative If mass of the substance is 20 g then the heat energy required to melt 1 g the substacne is ______J.