Question

electrovalent compounds have a high melting point and boiling point while covalent compounds have low melting point and boiling point explain

Answer 1

electrovalent or ionic compounds have strong intermolecular force.so it is not easy to break bond between atoms.
covalent compounds have weak intermolecular force between atoms .so it is easy to break bonds between them

Answer 2

The electrovalent compounds have dosent have strong electro satatic force between their atoms. So it can easily gain or loss ions ,So it has high boiling and melting point. while Covalent Compunds have stronger inter molecular forces between their ions So it has low boiling and melting point.