Question

hydrogen bonding is responsible for: select the correct answer below: the unexpectedly high boiling points for hydrides in period two the increasing boiling points for hydrides going down a group the low boiling points of nonpolar molecules none of the above

Explanation:

Hydrogen - bonding is a strong intermolecular force. In period two, hydrides like $HF$, $H_2O$, and $NH_3$ have hydrogen - bonding. This causes their boiling points to be much higher than expected compared to trends based on molar mass alone. For hydrides going down a group, the increase in boiling points is mainly due to increased London dispersion forces. Non - polar molecules have low boiling points mainly because they only have weak London dispersion forces and no hydrogen - bonding.

Answer:

the unexpectedly high boiling points for hydrides in period two