Among the following substances, the lowest vapour pressure is exerted by:

water

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alcohol

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ether

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mercury

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Solution

The correct option is C mercury
Vapor pressure of mercury is very low (compared to a liquid like methyl alcohol) because the forces of interaction between the individual metal atoms of mercury is quite a bit stronger than the cohesive molecular forces (such as a hydrogen bonding) that holds together several molecules in case of alcohols,ethers and water.

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