Question

out of h2o and h2s which has higher boiling point and why

Answer 1

Water has a higher boiling point than hydrogen sulphide. The intermolecular attractions between water molecules are stronger than H2S molecules due to hydrogen bonding in H2O due to high electronegativity and small size of oxygen atom.

Answer 2

Answer: $H_2O$ has higher boiling point due to hydrogen bonding.

Explanation:

Hydrogen bonding (H-bonding) is an intermolecular force having partial ionic-covalent character. H-bonding takes place between a hydrogen atom (attached with an electronegative atom e.g. O, N and F) and an electronegative atom (O,N and F).

Hydrogen bonding generally appears in covalent molecules.

Out of $H_2O$ and $H_2S$, $H_2O$ has higher boiling point as water molecules are bonded by strong hydrogen bonds.

Oxygen is a highly electronegative atom attached to a H atom through a covalent bond. Therefore O atoms gets partial negative charge and H atoms gets partial positive charge.

Hence an interaction arises between H atom and O atom resulting formation of H-bonding.