Q. 37

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 (CH3CH2CH2CH2CH2CH3), glycerine (CH2 OH CH(OH) CH2 OH)

Answer :

Water has hydrogen bonding existing as intermolecular forces, hexane has Vander Waal force of attraction existing as intermolecular force, glycerine also has hydrogen bonding as a major intermolecular force( has 6 hydrogen bond formed)

The increasing order of their viscosities is:


Glycerine > Water > hexane


Order is so because, Glycerine has most number of hydrogen bond, followed by water, and followed by hexane which has Vander Waal force of attraction.


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