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

Water, hexane $(C H_{3} C H_{2} C H_{2} C H_{2} C H_{2} C H_{3})$ glycerine $(C H_{2} O H C H (O H) C H_{2} O H)$

Open in App

Solution

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. there is hydrogen bonding which is stronger in case of glycerine (because of the presence of three -OH groups) than that in water, therefore the Water < glycerine

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

The order of intermolecular forces among the given liquids is Hexane < Water < Glycerine.

Suggest Corrections

Similar questions

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

Name the intermolecular forces existing in the following liquids : Water and glycerine

Name two intermolecular forces that exist between HF molecules in liquid state.

Q. Assertion :Viscosity of liquids decreases as the temperature rises. Reason: At high temperature, molecules have high kinetic energy and can overcome the intermolecular forces to flow faster.

Explain the effect of increasing the temperature of a liquid, on intermolecular forces operating between its particles. What will happen to the viscosity of a liquid if its temperature is increased?

Q. Increase in kinetic energy can overcome intermolecular forces of attraction. How will the viscosity of liquid be affected by the increase in temperature?

Join BYJU'S Learning Program