On supplying a constant heat to the boiling water during vaporization, the temperature of water
A
rises very slowly.
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B
rises rapidly until the whole water is converted into steam.
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C
first rises and then becomes constant.
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D
remains constant until the whole water is converted into steam.
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Solution
The correct option is D
remains constant until the whole water is converted into steam. During the phase change from liquid to vapour, after reaching the boiling point of the given liquid, some additional heat is required to convert the liquid into the vapour at the same temperature. This additional heat is known as latent heat of vaporization.