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  • The magnitude of surface tension of liquid depends on the attractive forces between the molecules. Arrange the following in increasing order of surface tension : water, alcohol (C_{2}H_{5}OH) and hexane [CH_{3}(CH_{2})_{4}CH_{4})]

The magnitude of surface tension of liquid depends on the attractive forces between the molecules. Arrange the following in increasing order of surface tension : water, alcohol (C_{2}H_{5}OH) and hexane [CH_{3}(CH_{2})_{4}CH_{3}]

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The molecules above are of water, alcohol, and hexane. Here water and alcohol are polar and have dipole-dipole interaction and intermolecular hydrogen bonding, whereas hexane is non-polar and has weak London dispersion forces.

H-bonding is stronger in water; hence, surface tension is also more in water than alcohol. Therefore, Hexane < Alcohol < Water.

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