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Solutions

Question
CBSEENCH12011273
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An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?

  • Addition of NaCl

  • Addition of Na2SO4

  • Addition of 1.00 molal KI

  • addition of water

Solution

D.

addition of water

Vapour pressure depends upon the surface area of the solution. Larger the surface area, higher is the vapour pressure.
The addition of solute decreases the vapour pressure as some sites of the surface are occupied by solute particles, resulting in decreased surface area. However, the addition of solvent, ie, dilution increases the surface area of the liquid surface, thus results in increased vapour pressure.
Hence, the addition of water to the aqueous solution of (1 molal) KI, result in increased vapour pressure.

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