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  • Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces, greater is the viscosity.

The viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. The stronger the intermolecular forces, the greater  the viscosity. Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscosities. Also, give a reason for the assigned order in one line. Water, hexane (CH_{3}CH_{2}CH_{2}CH_{2}CH_{2}CH_{3}), glycerine (CH_{2}OH \; CH(OH) CH_{2}OH).

Answers (1)

(a) Hexane has Vander Waal force of attraction present as the intermolecular force.

(b) Water has hydrogen bonding present in the form of intermolecular forces

(c) Glycerine has hydrogen bonding present as the intermolecular force

The reason behind this order is that in hexane, weak bonding forces exist; therefore, it has the least viscosity, whereas in water and glycerine, dipole-dipole interaction and extensive H-bonding are present. Glycerine has the strongest intermolecular forces. Therefore, the order of viscosity is:

Hexane < water < glycerine

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