Question

h2o liquid but h2s is gas.Explain why

Answer 1

In water due to presence of strong intramolecular H-bonds attraction among its molecules is high and hence water is liquid.

In H2S, attraction among its molecules is low as it lack H-bonds. So H2S is gas.

Answer 2

In H2O there is hydrogen bonding between the molecules because oxygen has a high electronegativity(only second to flourine).
So, the hydrogen atoms from a water molecule forms hydrogen bonding with oxygen of neighbouring water molecule resulting in strong intermolecular hydrogen bonding. This is why water is in liquid form at room temperature
While in case of H2S, the electronegativity of sulphur is low compared to oxygen so,the hydrogen bonding is negligible in case of H2S, and the only binding force is weak Van Der Wals or London force of attraction between the molecules. Therefore H2S is a gas at room temperature.