UPSC Prelims 2002·GS1·science-and-technology·science and technology

Which one of the following statements is correct?

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Last updated 23 May 2026, 3:31 pm IST
  1. AThe boiling point of an aqueous solution is higher than that of pure waterCorrect
  2. BAddition of solutes to a solution causes an increase in its water potential
  3. CThe vapour pressure of the water in a solution is lower than that of pure water
  4. DWhen a solution is separated from water by a semi permeable membrane, water movement can be prevented by applying pressure to the solution

Explanation

The boiling point of an aqueous solution is higher than that of pure water due to the colligative property known as boiling point elevation. When a solute is dissolved in water, it lowers the vapor pressure of the solution, requiring a higher temperature to reach the boiling point. Option B is incorrect because adding solutes to a solution always decreases its water potential, making it more negative, not increases it. Options C and D are also scientifically accurate statements about colligative properties and osmosis, but A is the designated correct answer.
science-and-technology: Which one of the following statements is correct?
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