Since ice and water are in equilibrium, the temperature would be zero. When we heat the mixture, energy supplied is utilised in melting the ice and the temperature does not change till all the ice melts because of latent heat of fusion. On further heating, the temperature of the water would increase. Therefore, the correct option is (d).
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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 (shown in figure given below) would correctly represent the result? Justify your choice.
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Mrs. Khanna was making breakfast in kitchen. For this purpose she was heating water in a pan. In the meantime, her 12 years old son, Pappu entered the kitchen and saw the water vapour coming out from the pan. Pretend yourself to be Mrs. Khanna and answer the following questions: (𝒊) What is the process going on in the pan? (𝒊𝒊) Why was this process occurring? (𝒊𝒊𝒊) Give one way by which Pappu can relate this phenomenon with his everyday life. (𝒊𝒗) What values are shown by Pappu?
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The temperature-time graph given alongside shows the heating curve for pure wax. From the graph answer the following: (a) What is the physical state of the substance at the point A, B, C and D? (b) What is the melting point of the substance? (c) What is the boiling point? (d) Which portions of the graph indicates that change to state is taking place? (e) Name the terms used for heat absorbed during change of states involved in above process.
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You are given the following substances with their melting and bowling points. Identify the physical status of X, Y and Z at room temperature (30°C).
| Substance | Melting point(°C) | Boiling point(°C) |
| X | -219 | -183 |
| Y | 119 | 445 |
| Z | -15 | 78 |