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Solutions question

2010 · Q104
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Solutions question

2010 · Q104

NEETChemistrySolutionsMCQ+4 / −1
An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?
  1. A
    Addition of NaCl
  2. B
    Addition of Na2SO4
  3. C
    Addition of 1.00 molal KI
  4. D
    Addition of water
View written solutionFree

Correct answer: D

Addition of solute decreases the vapour pressure as some sites of the surface are occupied by solute particles resulting in decreased surface area. However, addition of solvent, i.e., dilution increases the surface area of the liquid surface, thus results in increased vapour pressure. Hence, addition of water to the aqueous solution of (1 molal) KI results in increased vapour pressure.

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