1.

The hydrides of the first elements in groups 15-17, namely NH_3, H_2O and HF respectively show abnormally high values for melting and boiling points. This is due to

Answer»

Small size of N, O and F
the ability to form extentsive intermolecular H-BONDING
the ability to form EXTENSIVE INTRAMOLECULAR H - bonding
effectiv van der Waals'interaction.

Solution :`{:("ATOM","Electronegativity in Pauling scale"),(F,4.0),(O,3.5),(N,3.0):}`
Thus, `NH_3, H_2O` and HF can form extensive intermolecular H-bonding.


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