Question

In covalent hydride why melting and boiling point increases down the group

Answer 1

Answer:

An atom of hydrogen has 1 valence electron. Bonds between hydrogen and Group 16 atoms are covalent so the hydrides of Group 16 elements are covalent molecules. ... The melting point and boiling point of water (H2O) molecules is unexpectedly high due to the stronger hydrogen bonds acting between water molecules.