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At $25 ° C$ the vapour pressures of acetone, methanol and water follow the order, acetone > methanol > water. If 3 mL of each liquid is taken in 3 different watch glasses and kept open to atmosphere in a room at $25 ° C$ , which of the following statement is correct?

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Acetone will disappear completely from the watch glass first.

Water will disappear completely from the watch glass first.

None of the liquids disappear completely from the watch glass as there is equilibrium between evaporation and condensation.

Methanol will disappear completely from the watch glass first.

answer is C.

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Detailed Solution

As the liquids are open to atmosphere, no equilibrium can be established. The one with higher VP (most volatile of the three) disappears first.

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