The hydrides of the first elements in groups 15-17, namely NH_(3), H_(2)O and HF respectively show abnormally high values for melting and boiling points. This is due to

The hydrides of the first elements in groups 15-17, namely NH_(3), H_(

1.	The hydrides of the first elements in groups 15-17, namely NH_(3), H_(2)O and HF respectively show abnormally high values for melting and boiling points. This is due to
Answer» SMALL SIZE of N,O,F the ability to form extensive intermolecular H-bonding the ability to form extensive intramolecular effective van DER Waals interaction Answer :B