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(D) Since ice and water are in equilibrium,the initial temperature of the mixture is $0^{\circ}C$. When we heat the mixture,the energy supplied is uti

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$(d)$

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(D) Since ice and water are in equilibrium,the initial temperature of the mixture is $0^{\circ}C$. When we heat the mixture,the energy supplied is utilized in melting the ice (phase change from solid to liquid). During this process,the temperature does not change until all the ice has melted because of the latent heat of fusion. Once all the ice has melted,further heating causes the temperature of the water to increase. Therefore,graph $(d)$ correctly represents this process,as it shows a constant temperature at $0^{\circ}C$ for some time followed by an increase in temperature.

$A$ student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following graphs would correctly represent the result? Justify your choice.

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