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Question

When water is heated at 100C, we see no rise in temperature in the thermometer.


A

True

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B

False

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Solution

The correct option is A

True


This is true. When water starts to boil at 100C, the temperature does not rise in the thermometer. All the heat energy is used by the water particles to overcome the interparticle forces of attraction and to change their state from liquid to gaseous. This energy, also known as the hidden energy is called the latent heat of vapourisation.


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