Question
Explain why HF is less viscous than $\mathrm{H}_2 \mathrm{O}$.
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Answer
There is greater intermolecular hydrogen bonding in $\mathrm{H}_2 \mathrm{O}$ than that in HF as each $\mathrm{H}_2 \mathrm{O}$ molecule forms four H -bonds with other water molecules, whereas HF forms only two H -bonds with other HF molecules. Greater the intermolecular H-bonding, greater is the viscosity. Hence, HF is less viscous than $\mathrm{H}_2 \mathrm{O}$.
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