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Question

In an experiment, a thermometer is placed in a test-tube of hot liquid. The temperature reading of the liquid is recorded every half minute. The table shows the results. What is the melting point of the substance?

Time/minutes0.00.51.01.52.02.53.03.54.04.55.05.56.06.57.07.5
Temperature/oC73655955555551484542403836353433

A
0oC
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B
33oC
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C
55oC
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D
73oC
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Solution

The correct option is B 55oC
We know that at the phase changing time , the temperature of the substance is constant. So, by the exp. table it is observed that the temperature 55oC remain constant for some time. This means that the liquid is transforming into solid.
Therefore the melting point of ice is 55oC

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