The low density of ice compared to water is due to

The boiling point of a compound is raised by

The correct statement/s about Hydrogen bonding is/are:
$A$. Hydrogen bonding exists when $H$ is covalently bonded to a highly electronegative atom.
$B$. Intermolecular $H$ bonding is present in $o$-nitrophenol.
$C$. Intramolecular $H$ bonding is present in $HF$.
$D$. The magnitude of $H$ bonding depends on the physical state of the compound.
$E$. $H$-bonding has a powerful effect on the structure and properties of compounds.
Choose the correct answer from the options given below:

What is a hydrogen bond? Explain its characteristics with examples.

Out of $o$-nitrophenol and $p$-nitrophenol,which is more volatile?

The correct order of viscosity of the following liquids will be: