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Question
A block of ice at temperature −20∘C is slowly heated and converted to steam at 100∘C. Which of the following diagrams is most appropriate?
A block of ice at temperature −20∘C is slowly heated and converted to steam at 100∘C. Which of the following diagrams is most appropriate?
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Solution
The correct option is A
First, the ice at −20∘C converts to ice at 0∘C, so there is constant increase in temperature. Thus, the graph will be a straight line starting from the origin, where the temperature is proportional to the Heat supplied.
At 0∘C, change of phase occurs, thus the temperature remains constant while the heat supplied kept on increasing.
Water at 0∘C when heated increases it's temperature to become water at 100∘C. Thus, the graph will be a straight line where the temperature is proportional to the Heat supplied.
Finally, water at 100∘C changes to steam at 100∘C, resulting in a change of phase. Thus the temperature remains constant while the heat supplied kept on increasing.
Thus, graph (a) is the most appropriate depiction.
First, the ice at −20∘C converts to ice at 0∘C, so there is constant increase in temperature. Thus, the graph will be a straight line starting from the origin, where the temperature is proportional to the Heat supplied.
At 0∘C, change of phase occurs, thus the temperature remains constant while the heat supplied kept on increasing.
Water at 0∘C when heated increases it's temperature to become water at 100∘C. Thus, the graph will be a straight line where the temperature is proportional to the Heat supplied.
Finally, water at 100∘C changes to steam at 100∘C, resulting in a change of phase. Thus the temperature remains constant while the heat supplied kept on increasing.
Thus, graph (a) is the most appropriate depiction.
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