give reasons:-
ionic compounds are usually hard?
sodium chloride has a high melting point?
non-metals do not displace hydrogen from dilute acids/

3) non metals dont have the tendency to lose and gain electrons .But metals have .These electrons which are readily like potassium and and sodium are accepted by hydrogen ions of acids reducing to hydrogen gas however nonmetals dont lose electrons rapidly because of which they dont  displace hydrogen from acids .But, not all metals will displace hydrogen .Only those metals which are more reactive than hydrogen can displace hydrogen from acids

2)Sodium chloride has a high melting point because of the strong electrostatic attraction between its positive and negative ions; this requires more heat energy to overcome.


1) Ions not free to move in solid state. Anisotropic in nature.