Question

At its boiling point, which will have maximum vapour pressure? A. Water B. Ethanol C. Ether D. All have same
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Answer 1

Answer:Ether has the maximum vapour pressure at its boiling point compared to the rest

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Answer 2

Answer:

All of these will have same maximum vapour pressure. The answer is D.

Explanation:

Here is an attachment of a graph showing the vapour pressure curves versus temperature of water, ethanol and ether. At their boiling points i.e. Ether (34.6°C), Ethanol (78.4°C) and water (100°C) all of them have same vapour pressure that is 760 mm Hg.

The curves in the graphs have same inclination at their vapour pressure and the dotter line shows the same pressure in all the three substances.