A solid substance is at 30^{circ}C. To this s | vedclass

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(B) In a heating curve,the sloped portions represent a single phase where the temperature increases as heat is added,while the horizontal portions rep

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$CD$

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(B) In a heating curve,the sloped portions represent a single phase where the temperature increases as heat is added,while the horizontal portions represent phase changes where the temperature remains constant.$1$. The portion $AB$ represents the solid phase being heated.$2$. The portion $BC$ represents the phase change from solid to liquid (melting) at a constant temperature of $60^{\circ}C$.$3$. The portion $CD$ represents the liquid phase being heated from $60^{\circ}C$ to $210^{\circ}C$.$4$. The portion $DE$ represents the phase change from liquid to gas (boiling) at a constant temperature of $210^{\circ}C$.$5$. The portion $EF$ represents the gaseous phase being heated.Therefore,the substance is in the liquid state during the portion $CD$.

$A$ solid substance is at $30^{\circ}C$. To this substance,heat energy is supplied at a constant rate. The temperature versus time graph is as shown in the figure. The substance is in the liquid state for the portion of the graph:

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