Ncert Exercises & Solutions

Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces, greater is the viscocity. Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscocities. Also give reason for the assigned order in one line.

In water and glycerine - Hydrogen bonding and dipole-dipole interactions exists as both are polar molecules.

Hexane - Dispersion forces/London forces are present due to non-polar nature. The order of intermolecular forces among the given liquid is, hexane < water < glycerine.

Since, hexane has weakest intermolecular forces and glycerine the strongest (three OH groups) intermolceular forces. Therefore, hexane has minimum viscosity and glycerine has maximum viscosity.

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