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Standard XII
Chemistry
Properties of Water
Question

When water boils the temperature remains constant. Give reasons.

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Solution
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  • Water starts boiling at 100oC temperature. After this temperature., the temperature of water becomes constant for some time even after the constant supply of heat.
  • Here the heat supplied is used to overcome the intermolecular force of attraction present in a water molecule to convert it into vapour.
  • This heat is known as latent heat of vaporization.
  • The change in temperature only takes place after conversion of water into vapour.

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