In comparison to pure water, Boiling point of impure water 

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JKSSB JE Civil Jal Shakti 5 Dec 2022 Official Paper (Shift 2)
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  1. is same
  2. increases
  3. decreases
  4. first decreases then increases

Answer (Detailed Solution Below)

Option 2 : increases
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Detailed Solution

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Explanation:

  • Boiling point of a solution is generally defined as the the temperature at which the vapor pressure of a liquid is equal to the pressure of the gas above it.
  • Adding impurities to a solution, in most cases, increases the boiling point of the solution.
  • This occurs because the presence of impurities decreases the number of water molecules available to become vaporized during boiling. Once this occurs, it takes a greater amount of heat to cause the same amount of impure solution to vaporize as it would take to cause a pure solution to vaporize, thus raising the solution's overall boiling point.
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