Ncert Exercises & Solutions

Among water, ether, and acetone, water has the maximum boiling point and ether has the minimum boiling point. The correct order of vapour pressure of water, acetone and ether at $30 ° C$ is-

1. Water<ether<acetone

2. Water<acetone<ether

3. Ether<acetone<water

4. Acetone<ether<water

Hint: Magnitude of vapour pressure and boiling point are inversely proportional to each other

The given compounds are

\underset{(Maximum b p)}{Water}, acetone, \underset{(Minimum b p)}{ether}

Greater the boiling point, lower is the vapour pressure of the solvent.

The boiling point of water is 100 ^oC, acetone boiling point is 56 ^oC, and ether boiling point is 34.6 ^oC. Hence, the correct

order of vapour pressure will be-

Water<acetone<ether.

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